Marketing to the Greeks is probably the biggest way to get more students involved.
Perhaps some sort of crazy promotion to capture their (Greeks) sense of fun, competition, and charity work to make the croud more involved.
Something like:
The goal is to get the crowd involved and raise money for their charity, and involve the nex tgeneration of Bradley fans.
Bradley sets aside 4 games, and gives 2 houses blocks of 200 seats. (opposite ends of the arena to get cross-changs going) The houses can only fill out to 25% of those seats whith their own, the remaining must be filled by partenering with an area JH or HS. (Get them to show in their own school colors and make noise)
The houses then need to solicit donations from businesses to provide some form of croud cheer / participation device (like signs, baloons, thunder sticks..) which the house sells to the rest (or their half) of the crowd (for no more than $2 a person). Each hose is given at least one timeout to get the crowd involved.
The house gets to keep 100% of those sales for their charity, and at the end of the game, the house that got the best overall crowd participation gets an additional $500 for their charity.