My team dosent' usually have this problem(as we dont have many people)
But we give everyone different assignments(scouting,talking to judges/other teams,etc..)
Usually everyone who's not on the drive team is in the stands or walking around the pits looking at other teams/robots/cool stuff......
I think this is because our robots' seem to be unbreakable for some reason(I think this has something to do with us being overweight all the time too
) so we dont usually need more than 4 students is the pits anyways(drive team and safety captain)
If its a space problem try reorganizing your pit(worked well for us)