The Warriors have a home game vs. Utah that day, so my guess is that whatever allstar game you're talking about is somewhere else.
Found the rosters through the events Facebook page. Looks like the underclass game is in June.Found a link, but not anything about lineups on it, just the vague "Top 30 Norcal and SoCal HS Boys and girls"
https://www.worldgamestournament.org/all-star-game
Apparently there are several games, probably four. Underclass and Senior boys and girls.
Seems to me the CIF wouldn't take too kindly to a postseason underclass all-star game.
Saw on the news this morning that this game was a big success...............