Each game can be played as a fundraiser. For example:
Pitchburst
Get a VIP (mayor, school faculty member, coach, celebrity) to sit under the "splursh basket". Charge $1, $3, $5 or more to throw 3 balls and try to "splursh" them.
Downpour Derby
Get a VIP (mayor, school faculty member, coach, celebrity) to be the "host" and charge players $1, $3, $5 or more to try and win and soak the VIP.
Boom Blaster
Charge a fee to play - racing side by side with others (who also paid). Give the "winner" a low-cost prize.
Put prize coupons inside the balloons, and charge people to play. Winners get the prize in their balloon coupon - or collect multiple coupons to win concession prizes.