Shoot-around tonight?

Bringing a bunch of kids to the game tonight. TD Garden says doors open at 7 tonight for the 8pm game. I think doors usually open 90 minutes before the game. Do you think if we are there at doors that we can catch some of the Celtics warm-up? I'm concerned with the late doors tonight (due to the bruins game) there won't be much if any of the typical shoot-around time. Thanks!