Today, April 17th 2021 marks the 50 year anniversary of the first official Blackmoor Game session. The session was announced in Dave Arneson's fanzine, Corner of the Table Top (Vol. 3 No. 4), where shared gaming updates with other gamers in the Twin Cities area of Minnesota.
The announcement for the game read:
There will be a medevil "BRAUNSTEIN" April 17, 1971 at the home of David Arneson from 1500 hrs to 2400 hrs with refreshments being available on the usual basis. Players may come at any time and any number are welcome to attend what should prove to be an exciting time. It will feature mythical creatures and a poker game under the Troll's bridge between sunup and sundown.