May 15 is National Role Player's Day, according to Celtics lore Also OTD in Celtics history: Grant Williams' Game 7 heroics In G7 of the 2022 conference semis, Williams played the best game of his NBA career: 27 PTS (game-high) and 7 3PM as the C's advanced past the Bucks https://t.co/7ur2No4I6O