I've been thinking about doing this for a long time, but never found the right moment to work on it. Now I've realized that it's as easy as start a thread and compile as many dates as people may want to add.
You can copy/paste all the events already posted by others and add them to your post, or simply add a bunch of new ones and someone else will make and updated list, which will be added to this main post on a regular basis.
All kinds of events attended by the Maestro, awards/nominations, concerts, recording sessions, even original album releases, are welcome to the list.
Here's a start with some examples:
1932/02/08 - John Towner Williams is born in Queens, New York
1976/03/29 - John Williams wins his 2nd Academy Award for the original score for Steven Spielberg's "Jaws"
2020/01/29 - John Williams wins the Grammy Award in the Best Instrumental Composition category for his "Star Wars: Galaxy’s Edge Symphonic Suite"
2020/01/31 - Jim Svejda interviews John Williams on KUSC Radio
2020/02/08 - John Williams saluted at the Society of Composers & Lyricists’ annual Oscar music reception
2021/07/24 - John Williams conducts the World Premiere of his "Violin Concerto No. 2" at Tanglewood, with Anne-Sophie Mutter on violin
2021/08/14 - John Williams conducts the World Premiere of his new work "Overture to the Oscars" at Tanglewood
Feel free to expand the event descriptions, as long as they're not too long (this isn't a biography but a chronological list).
I'm sure it'll be fun!