There may be one though it sounds like a terrible idea: https://basketball.realgm.com/wiretap/261306/NBA-NBPA-Discuss-Holding-All-Star-Game-In-March
If your going to do a one day event, Forget about the game and just do the challenges. 3pt contest Dunk contest Skills challenge Horse
it's a terrible fucking idea in the middle of a raging pandemic when Covid mutations are going apeshit, why the hell get people together, creating more vectors for infection, for a completely meaningless joke of a game?