[New Lightning]

One important thing that I found while conducting team building activities is humor. Make whatever you are doing funny, whether it be throwing pumpkins or solving a grid logic puzzle. A little self deprecation on the part of whoever the leader is going to be is never a bad idea; however, they do need to know where the line is so that the team members they are supposed to be supervising don't respect their authority.

I would also go so far as to separate the team based on their individual roles during build season, and have the individual sub-team leaders conduct the team building.

I would then highly recommend conducting follow up team building after build season is over but before you go to competition in order to help facilitate the transition. Because as I'm sure it is on most teams, individual roles change once the team actually gets to competition, which usually means that new people are in charge and the make up of individuals on specific teams is different.