First Fantasy Campaign Day

lkh pointed this out on a different channel, but April 17 is the anniversary of the start of the first fantasy campaign:
‘There will be a medieval “Braunstein” April 17, 1971 at the home of David Arneson from 1300 hrs to 2400 hrs with refreshments being available on the usual basis…. It will feature mythical creatures and a Poker game under the Troll’s bridge between sunup and sundown’
—Peterson, Jon, “Playing at the World”
of course how much of that already was similar to Dungeons and Dragons as it was established later might be up for debate. The game was advertised as a Braunstein, which was a format that Dave Wesely came up with in which players took over roles in a town and tried to further their own agendas (as a prelude to a larger battle, but that one seems to have fallen to the wayside in the end)