Big Guava Music Festival: Outkast: In all over 40 acts will be spread across four stages, plus food trucks, thrill rides and craft beers. In addition to the headlining rap duo, Cake, Sleigh Bells, Twenty One Pilots, Jake Miller, Smallpools, Nonono, Vic Mensa, Unlikely Candidate and Betty Who will also perform today. 4 p.m., MidFlorida Credit Union Amphitheatre at the Florida State Fairgrounds, 4802 U.S. 301 N, Tampa. $99-$165. (813) 740-2446; bigguavafest.com.
Kentucky Derby Weekend: You can wager and watch the Kentucky Derby at the greyhound track, where every TV in the place will be tuned to Churchill Downs on Saturday. Doors open at 10 a.m., Derby Lane, 10490 Gandy Blvd., St. Petersburg. Free. (727) 812-3339.
Burger Showdown: Chefs from Danny's All American Diner, Ferg's, Eats American Grill and other Tampa Bay restaurants fire up their grills in competition to create the Best Burger in Tampa Bay. 5 p.m., Curtis Hixon Park, 600 N Ashley Drive, Tampa. $25. Includes unlimited burger sampling, dessert samples and one drink ticket. burgershowdown.org.
Thomas Meighan and Black Maria Film Festivals: This double feature showcases work by local filmmaker Bobby Marinelli of Hudson, as well as official international selections from some of the largest critically acclaimed film festivals. 7:30 p.m., Richey Suncoast Theatre, 6237 Grand Blvd., New Port Richey. $8. (727) 992-0024.
The Mavericks: The Grammy Award winning country group who emerged from Miami in 1989 has reunited after an eight year hiatus. 8 p.m., Capitol Theatre, 405 Cleveland St., Clearwater. $45-$55. (727) 791-7400.
KIDS AND FAMILY
Freaky Friday: Summer Splash Bash: A kid's night out program for children in grades K-5 includes one slice of pizza, a drink and themed activities, including swimming and dancing. Ages 3-5 have a pool party from 7 to 10 p.m., grades K-5 have the run of the recreation center from 7 to 11 p.m. 7 p.m., Seminole Family Aquatic Center, 9100 113th St. N, Seminole. $15, $10 members. (727) 391-8345.
Shark Tank, 9 p.m., ABC A flower merchant comes before the sharks with a business that revolves around goods grown on an active volcano. Uh, that seems unecessarily risky.
MORE TO EXPLORE
Find things to do this weekend for less than $5 at tampabay.com/things-to-do.