1957
October 19th
Michael Audrey Myers is born in Haddonfield, Illinois.
[Year comes from "Halloween (1978)," and the exact date is stated in "Halloween: Resurrection (2002)"]

1961
Laurie Myers is born.
["Halloween (1978)"]

1963
October 31st
A 6 year old Michael Myers stabs his 17 year old sister, Judith, to death with a kitchen knife, and soon after is commited to Smith's Grove psychiatric hospital by a court where he is put under the care of Dr. Sam Loomis.
["Halloween (1978)"]

1964
May
Dr. Loomis makes a solemn plea to the board of governors in Illinois to have his patient, Michael Myers, transferred to a maximum security psychiatric ward believing that Michael's catatonic state is merely an act, and that he is a highly potential, dangerous threat.  Unfortuantely, his request is denied, and Michael remains in Smith's Grove Sanitarium.
[As seen in the television version of "Halloween (1978)."]

1965
The Myers' parents die.  Laurie is soon adopted by the Strodes, and thus, her last name is changed to Strode.  The file on Laurie is sealed by the request of the Strodes.

1971
After trying to reach the catatonic Michael Myers for the past eight years, Dr. Sam Loomis resolves himself to the realization that Michael is beyond anyone's help, and dedicates himself to keeping Michael locked up for the rest of his life.
["Halloween (1978)"]

1978
October 30th
While Dr. Sam Loomis and Nurse Marion Chambers drive to Smith's Grove in order to transfer Michael to Harden County for trial, the 21 year old Michael Myers escapes from the hospital and hijacks their station wagon.  He proceeds back home to Haddonfield, Illinois.
October 31st
Michael Myers returns to Haddonfield with Dr. Loomis hot on his trail, but by the time he catches up with Michael, several teenagers have been murdered by his patient's deadly hands.  Dr. Loomis is able to save the life of Michael's 17 year old sister, Laurie Strode, at the Doyle residence by shooting Michael six times from his licensed revolver, but despite the injuries he certainly sustained, Michael survives and continues on to kill more Haddonfield residents.  Laurie is taken to Haddonfield Memorial Hospital while Loomis and Sheriff Brackett attempt to track down Michael, and ultimately find him stalking Laurie at the hospital.  Having Michael trapped, Loomis intentionally causes an enormous explosion using the combination of oxygen and ether.  Laurie Strode is taken away to another hospital while a catatonic Michael is transported to the Ridgemont Federal Sanitarium.  Dr. Loomis also survives the fiery incident.  This night, Michael has killed a dozen people.
["Halloween (1978)" and "Halloween II (1981)"]

1980
Laurie Strode gives birth to Jamie Lloyd with Jimmy Lloyd as the father.  Apparently, Laurie and Jimmy wed sometime before this because Jamie has her father's last name, but it is not known when this happened.
["Halloween 4: The Return of Michael Myers (1988)"]

1981
Sheriff Leigh Brackett retires, relocates to St. Petersburgh, Florida, and Ben Meeker becomes the new Sheriff of Haddonfield.  Laurie Strode gives birth to her son John .
[Sheriff info from"Halloween 4: The Return of Michael Myers (1988)", Strode info from "Halloween: H20 - Twenty Years Later (1998)"]

1987
November/December
Laurie Strode fakes her own death via a car accident, relocates to California, and changes her name to Keri Tate.   She takes her son John with her, but not her daughter Jamie who is put into foster care with the Carruthers family.  Dr. Loomis is one of the very few that is aware of what Laurie has done, and where she has gone.  It is unknown what really happened to Jamie's biological father, Jimmy Lloyd.
["Halloween: H20 - Twenty Years Later (1998)".  In "Halloween 4: The Return of Michael Myers (1988)," Jamie tells her foster sister Rachel Carruthers that it's been eleven months since her parents died.]

1988
October 30th
While being transferred from the Ridgemont Federal Sanitarium, Michael reawakens to learn of his 9 year old neice, Jamie Lloyd.  He murders everyone in the ambulance and once again, makes his way back to Haddonfield.
October 31st
Dr. Loomis learns of Michael's escape, and is irate about it.  He soon makes his way to Haddonfield, encountering Michael on the way at a gas station which Michael leaves in flames.  Loomis hitches a ride to Haddonfield, but Michael has already begun stalking his next potential victims.  Once in town, Loomis coordinates with the local police force to get everyone off the streets, and to begin the hunt for Michael.  The night goes on with Michael killing nearly the entire police force and innocent civilians in an attempt to reach his neice.  Ultimately, Michael is confronted by state authorities and is shot down into an abandoned mineshaft.  Explosives are thrown in and detonate.  Michael is believed to be dead.  In the aftermath, Jamie seems to have inherited Michael's curse as she brutally attacks her foster mother, and appears to be in a semi-catatonic state.
["Halloween 4: The Return of Michael Myers (1988)"]

1989
October 31st
In actuality, after Michael Myers was shot down by state authorities, he washed out into the river after falling down the mineshaft.  He eventually flaoted down river, and came into the care of a hermit for the next twelve months.  Though, when Michael reawakens after one year, he kills the hermit who cared for him, and resumes his pursuit of Jamie Lloyd who has been committed to the Haddonfield Children's Clinic ever since she attacked her foster mother one year ago.  Shortly after visiting Jamie at the clinic, Rachel Carruthers becomes one of Michael's first victims when he arrives back in Haddonfield, and news of this devastates Jamie.  It is soon realized that Jamie has some degree of telepathic bond with Michael, and she can see where and when he will strike next.  Dr. Loomis pushes Jamie for her to help him find Michael, but the victims continue to stack up as Michael comes closer and closer to reaching Jamie.  Eventually, Loomis orchestrates a trap inside the old Myers home for Michael, and the hometown killer gets pounded senseless by Dr. Loomis until the police arrive to take Michael into custody.  Though, a massacre occurs at the police station as a mysterious Man in Black frees Michael, and abducts Jamie.  Neither Michael nor Jamie are heard from for the next six years.  Very shortly after these events, Haddonfield bans the celebration of Halloween from the town.
["Halloween 5: The Revenge of Michael Myers (1989)" ]
[It is stated in "Halloween: The Curse of Michael Myers (1995)" that Halloween has not been celebrated in Haddonfield since 1989.]

1990
Dr. Loomis has cosmetic surgery to remove the somewhat unsightly scar tissue upon his face from the inferno he ignited at Haddonfield Memorial Hospital back on Halloween night, 1978.  Kara Strode is fed up with how badly her father treats her and her illegitimate infant son Danny, and moves out hoping to make a life for the both of them away from her family.
[Dr. Loomis mentions his cosmetic surgery to Dr. Wynn at the start of "Halloween: The Curse of Michael Myers (1995)."  Mention is also made of Kara's heavily conflicted past with her father, and that she only recently moved back in with her family after several years.]

1995
January
The Man in Black has Jamie Lloyd impregnated with Michael's genetic material.
Summer
John Strode inherits Strode Realty from his brother, and after realizing that no one will take the old Myers home, he moves his own family into it.  Shortly thereafter, Kara Strode resolves to moving back in with her family, but her father still treats her and Danny terribly.  Though, her mother, Debra Strode, is very sympathetic, and Kara enrolls in a local college.  After six years, Haddonfield relinquishes the ban on Halloween, but many see this as a bad omen as they fear the worst may happen.
October 30th
The 15 year old Jamie gives birth to her son, and with the help of a sympathetic nurse, she is able to escape the facility where she's been locked up in for the last six years.  Michael persues her, and despite Jamie's call-in pleas for help on the Barry Simms radio show, she's dismissed as a prank.  Shortly thereafter, Michael catches up with her, and murders his own neice at a farm some number of miles out of Haddonfield.  Meanwhile, the now retired Dr. Sam Loomis is paid a visit by his longtime colleague Dr. Terrence Wynn at home.  Wynn makes a toast to Loomis' retirement, but also proposes for Sam to take his place as the head of Smith's Grove.  Though, Loomis hears Jamie's cries for help on the radio, and immediately sets out for Haddonfield.  A survivor of Michael's original massacre, Tommy Doyle, has become obsessed with Michael Myers, and also hears Jamie's cries on the radio.  The next day, he sets out to investigate.
October 31st
Living across the street from Tommy are the Strodes - relatives of Laurie's adoptive family.  They have recently moved into the remodeled Myers house, but everyone in the family - besdies the father - are unaware of its history.   Apparently, young Danny Strode - son of Kara - is being haunted by the image of the Man in Black telling the child to "kill for him."  During his investigation, Tommy finds Jamie's baby in a bathroom at the bus depot, and makes it a priority to take the best of care of him.  He takes the baby to the hospital for care, meets Dr. Loomis there, and explains as much as he can before having to elude hospital security.  Dr. Loomis attempts to warn the Strodes, but Michael is already too close by.  Both of Kara Strode's parents are murdered in their home by Michael.  Meanwhile, Tommy names the baby Stephen, and informs Danny and his mother Kara about his theories on Michael's origins.  He believes that Michael is driven by the power of Thorn - an ancient rune which plagued Druid families for centuries on Halloween.  Eventually, one child was cursed with the power of Thorn, and thus, chosen to sacrifice his entire family to benefit the entire clan.  That night, Tommy and Loomis meet at a Halloween carnival in town, but after discovering the dead body of loud mouthed shock jock Barry Simms, they move quick to get Jamie's baby and the remaining Strodes to safety.  In the meantime, Michael kills Kara's brother and his girlfriend in the Myers house.  Tommy and Loomis race back to Kara and Danny, but they are too late as the Man in Black has once again appeared, and reveals himself to be Dr. Wynn.  Kara, Danny, and Stephen are taken to Smith's Grove, and after awakening from being drugged, Tommy and Dr. Loomis make for Smith's Grove as well.  Wynn's ultimate motives aren't revealed, but some form of genetic engineering is implied.  Whatever the case, Michael ultimately kills all the doctors, including Wynn, that are in the operating room where Stephen and Danny were being kept.  Tommy eventually injects Michael with some unmarked chemicals, and he bludgeons Michael into unconsciousness with a pipe.  Tommy, Kara, Danny, and Stephen escape, but Loomis remains behind because of "some business I have to attend to."  Michael abandons his bloodied mask, and Dr. Loomis is heard screaming in the halls of Smith's Grove.
["Halloween: The Curse of Michael Myers (1995)"]

1996-1997
As his health falls deathly ill, Dr. Sam Loomis is placed under the care of Marion Chambers-Whittington, and eventually dies of natural causes.
["Halloween: H20 - Twenty Years Later (1998)"]

1998
October 29th
Michael Myers returns to murder Marion, steal Dr. Loomis' file on Laurie Strode, and escapes before anyone realizes what has happened.
October 31st
Keri Tate, the woman formerly known as Laurie Strode, is living in Summer Glen, California as a teacher at Hillcrest Academy, and has been trying to deal with her inner demons rather unsuccessfully.  She's become alcoholic, and despite her current romantic relationship with fellow teacher Will Brennan, she won't allow anyone to get intimate with her.  She's also very protective of her 17 year old son John, and despite her deepest hopes that her homicidal brother Michael is dead, she fears that he still stalks in the shadows.  Her fears soon prove right as Michael finds her, and begins to kill off anyone in his path.  Michael attempts to kill, not only Laurie, but her son John.  Realizing that she will never be free of the haunting memories of her brother, Laurie locks down the entire school, and confronts Michael one-on-one.  She eventually murders Michael, and authorities arrive shortly thereafter.  Though, John, his girlfriend Molly, and security guard Ronny have sustained injuries, they survive with the help of paramedics.  But driven by her obsession with Michael, and the belief that he is not truly dead, yet, she hijacks the coroner's van with a bodybagged Michael inside.  She drives it off the road, pins Michael between a tree and the van as she decapitates him with an axe.  Unfortunately, Laurie was unaware that, back at the school, Michael had crushed the larynx of a paramedic and switched outfits with him.  Laurie unknowingly murdered an innocent man, and Michael slips away unnoticed.  Shortly thereafter, Laurie is committed to a mental institution after being convicted of killing the paramedic.
["Halloween: H20 - Twenty Years Later (1998)"]

2001
October 30th
Michael Myers appears at the same mental institution where Laurie has been committed to.  He kills a few guards on his way in, and finally, by way of stabbing and a fatal fall from the rooftop, is able to kill his sister Laurie after 22 years.  Michael proceeds back home to Haddonfield, Illinois.
October 31st
Freddie Harris' Dangertainment has setup a live internet camera show at the Myers house, and have chosen a group of lucky (or unlucky) students from Haddonfield University to stay the night in the condemned home and discover its so-called secrets to earn an exclusive scholarship.  When night comes, these student eventually discover that everything in the house is fiction as it is simple art direction by Dangertainment for the show, but that is the least of their worries as Michael Myers has arrived and begun to kill off everyone in the house.  The only survivors are Freddie Harris and student Sara Moyer who tangle Michael up in electrical cables inside the garage.  The entire Myers estate burns to the ground as police, firefighters, and paramedics arrive on the scene.  Michael's heavily burned body is placed in a bodybag and taken to the morgue.  Though, when the coroner goes to do her autopsy, she opens the bodybag, and is shocked when Michael suddenly awakens.  As of now, the whereabouts of Michael Myers are unknown, but he is alive.
["Halloween: Resurrection (2002)"]