Everyone loves a little healthy competition. Add to that some sand, a celeb or two, and grown-up drinks, and we're in! This Saturday is the sixth annual Volleywood Beach Bash, a beach party and volleyball tournament hosted by Chicago Sport and Social. North Avenue Beach is about to become one giant party, and about 5,000 savvy Chicagoans will be there to enjoy it. The contest starts at 8 a.m., and over 300 teams will compete for $5,000 in prizes. At noon, the party starts, and guests can sip something cool and refreshing while catching performances by Lil Jon, Too White Crew, DJ Rock City, and DJ Ryan Pullano. Tickets are $10, but one Refinery29 reader will get in free, with three friends in tow. Just tweet this story and tag @refinery29, and we'll pick a winner at noon tomorrow. So, tweet fast, then locate your best bikini (and strongest SPF) to hit the beach!