The reason we're having teams for this event is so that you have someone to take the picture with you and your bike so you don't have to hand off your camera to strangers every time. You need to have you and your bike in the picture so a teammate is ideal. That being said, there isn't really a limit to team size BUT if you have a team of more than two, everyone on the team except for the person taking the picture HAS TO BE IN THE PICTURE. Otherwise people could be on 'teams' but split off.
Just want to give everyone a head's up.