Looking for one last taste of summer fun before the weather changes for good? You might find it this weekend at a water balloon battle planned by The Happiness Project.

The event will feature 3,000 water balloons and all sorts of uses for them: bracket-style matchups between four-person teams, target practice, and a free-for-all round, according to Leslie R. Rith-Najarian '12, an organizer of the event and member of The Happiness Project.

Over 20 teams have signed up, Rith-Najarian said, and individual drop-in participants are also welcome. The battle will be held on the MAC Quad at 8 p.m. on Saturday.

The water balloon blow-out is the kickoff of the Happiness Olympics, a series of five Saturday night events which will include a Nerf dart war, Capture the Flag, The Office Olympics, and a giant obstacle course. Teams that enter multiple events can accumulate points toward prizes like movie tickets and a trip to a trampoline park in Boston.