1976

Dates Unknown

 * Chad Boyle attempts to kill Ace; and, in at least one instance, succeeds. (NA: Timewyrm: Revelation)
 * In San Francisco, Carolyn McConnell meets the Doctor and Sam Jones, who are hunting vampires. (EDA: Vampire Science)

January

 * 12 - Agatha Christie dies. (DW: The Unicorn and the Wasp); at some point soon before her death, she is visited by the Doctor and Donna Noble, who remind her of the cirumstances surrounding her disappearance in the 1920s. (DW: The Unicorn and the Wasp; deleted scenes)

Summer

 * The Vardans attempt an invasion of Earth with Mortimus' assistance. (NA: No Future)

Late Summer or Early Autumn

 * Brigadier Alistair Lethbridge-Stewart retires from UNIT and becomes a teacher at Brendon Public School. (DW: Mawdryn Undead)

January

 * 3 - DW: The Brain of Morbius Episode 1 is first broadcast.
 * 10 - DW: The Brain of Morbius Episode 2 is first broadcast.
 * 15 - DWN: Doctor Who and the Loch Ness Monster is first published.
 * 17 - DW: The Brain of Morbius Episode 3 is first broadcast.
 * 24 - DW: The Brain of Morbius Episode 4 is first broadcast.
 * 31 - DW: The Seeds of Doom Episode 1 is first broadcast. This is the last serial to feature UNIT in a major way until 1989's DW: Battlefield.

February

 * 7 - DW: The Seeds of Doom Episode 2 is first broadcast.
 * 14 - DW: The Seeds of Doom Episode 3 is first broadcast.
 * 19 - DWN: Doctor Who and the Dinosaur Invasion and DWN: Doctor Who and the Tenth Planet are first published, the latter being the first Target Books-commissioned novelisation of a solo First Doctor story (the initial three published in 1973 were in fact reprints of novels first published in the mid-1960s).
 * 21 - DW: The Seeds of Doom Episode 4 is first broadcast.
 * 28 - DW: The Seeds of Doom Episode 5 is first broadcast.

March

 * Campbell Singer, who played the King of Hearts, Sgt. Rugg, and Joey the Clown in DW: The Celestial Toymaker dies.
 * 6 - DW: The Seeds of Doom Episode 6 is first broadcast, ending Season 13.
 * 18 - DWN: Doctor Who and the Ice Warriors is first published.

May

 * 20 - DWN: Doctor Who - The Revenge of the Cybermen is first published.

July

 * 22 - DWN: Doctor Who and the Genesis of the Daleks is first published.

August

 * 6 - William Mervyn (Sir Charles Summer in DW: The War Machines), dies in London.
 * 19 - DWN: Doctor Who and the Web of Fear is first published.

September

 * Doctor Who Annual 1977 published.
 * Terry Nation's Dalek Annual 1977 published.
 * The Doctor Who and the Daleks Omnibus published.
 * 4 - DW: The Masque of Mandragora Episode 1 is first broadcast, starting Season 14.
 * 11 - DW: The Masque of Mandragora Episode 2 is first broadcast.
 * 18 - DW: The Masque of Mandragora Episode 3 is first broadcast.
 * 23 - DWN: Doctor Who and the Space War is first published. This adaptation of DW: Frontier in Space was the last Target Books novelisation to use a title significantly different from that of the source material (other than the practice of adding Doctor Who and... to the titles, which remained in place for several more years, and the occasional spelling deviation).
 * 25 - DW: The Masque of Mandragora Episode 4 is first broadcast.

October

 * 2 - DW: The Hand of Fear Episode 1 is first broadcast.
 * 4 - BBCR: The Time Machine, a special radio story featuring Tom Baker and Elisabeth Sladen is broadcast by BBC Radio as part of its Exploration Earth series. This is the first made-for-radio Doctor Who adventure and the last of its kind until BBCR: Slipback in 1986.
 * 9 - DW: The Hand of Fear Episode 2 is first broadcast.
 * 16 - DW: The Hand of Fear Episode 3 is first broadcast.
 * 17 - The New Avengers debuts on UK television. This is a revival of the series The Avengers created by Sydney Newman, and predates both Star Trek: The Next Generation and Doctor Who as one of the first revivals of a "genre" TV series.
 * 21 - DWN: Doctor Who and the Planet of the Daleks is first published. Although not widely recognized as such, the original serials DW: Frontier in Space and DW: Planet of the Daleks formed one story arc. As such, by Target Books publishing the adaptation of Frontier (as DWN: Doctor Who and the Space War) in September, followed by part 2 this month, these two books actually predate the two-volume novelisation of DW: The Daleks' Master Plan (widely considered the first occurrence of this).
 * 23 - DW: The Hand of Fear Episode 4 is first broadcast. Elisabeth Sladen leaves the series with this episode (but she'll be back).
 * 30 - DW: The Deadly Assassin Episode 1 is first broadcast. The Master returns; this story is also the first (and to date, only) televised serial in which the Doctor does not share an adventure with a companion, or even a companion figure.

November

 * 6 - DW: The Deadly Assassin Episode 2 is first broadcast.
 * 13 - DW: The Deadly Assassin Episode 3 is first broadcast.
 * 20 - DW: The Deadly Assassin Episode 4 is first broadcast. Following this episode, Doctor Who takes a mid-season break that lasts 6 weeks (returning on 1st January 1977). This is the first time a season of Doctor Who has been divided in such a fashion (and the only previous interruption had been a 2-week preemption during the 1968 Summer Olympics).

December

 * 16 - DWN: Doctor Who and the Pyramids of Mars is first published.
 * The second edition of REF: The Making of Doctor Who is published by Target Books; this is a revised version of an earlier book first released by another company, Piccolo Books, in 1972, but updated to include the Fourth Doctor.
 * The Doctor Who Dinosaur Book is first published.
 * 31 - The Daily Mirror publishes an exclusive short story, Doctor Who and the Hell Planet; this is the first original Doctor Who short story to be published in a newspaper, or outside of an Annual. The next original newspaper-exclusive short story wouldn't be published for another 30 years.

Unknown

 * Doctor Who and the Pescatons is released on LP by Argo Records. Discounting educational programmes, this is the first original audio drama based upon the franchise, predating the releases of Big Finish Productions by decades.