RPGA
The RPGA (also called the Role Playing Game Association and the RPGA Network at various times), was initially part of the organized play arm of https://en.wikipedia.org/wiki/TSR,_Inc and then https://en.wikipedia.org/wiki/Wizards_of_the_Coast. From 1980 to 2014, it organized and sanctioned role-playing games worldwide.
See https://en.wikipedia.org/wiki/RPGA for more information.