1 Incredible Dog Challenge: Athletic dogs from around the country compete in a variety of "Olympic-style" events at St. Petersburg's Spa Beach this weekend for the Eastern Regionals of the Purina Pro Plan Incredible Dog Challenge. Events include high-flying disc routines, weave pole racing, agility, Jack Russell hurdle racing and dog diving — where dogs take a running leap off a 40-foot dock into a 19,000-gallon pool. It runs 8:30 a.m.-5 p.m. Friday, 11 a.m.-4 p.m. Saturday at 615 Second Ave. N, St. Petersburg. Free for spectators. 2 Primavera Music Festival: This new festival highlighting Florida bands includes music by Ethan Parker, the Black Honkeys, Soul Circus Cowboys and Have Gun, Will Travel. There will also be hot air balloon rides, a hot air balloon Easter egg drop, arts and crafts expo, nine food trucks and a choreographed fireworks display. 2-10 p.m. Saturday at Waterfront Park, 110 Veterans Memorial Lane, Safety Harbor. Free, $25 reserved, $100 VIP. p rimaverafest.com. (727) 441-1790.3 First Friday at the Plant Museum: The museum will be open with free admission from 5-7 p.m. Explore the nation's only Victorian railroad resort hotel museum, with a tastings table. A docent-led tour of the museum will begin at 5:15 p.m. Matt Weihmuller's Jazz Trio will play on the veranda. Weihmuller is a saxophone instructor at the Patel Conservatory. 401 W Kennedy Blvd., Tampa. 4 Pawfest: The kid and canine carnival at Largo Central Park includes inflatables, games, face painting, pet contests, agility and K9 demonstrations, car show, food, clowns and a "doggie fun zone." 9 a.m.-2 p.m. Saturday. 101 Central Park Drive, Largo. Free.5 USF Spring Plant Festival: Get some inspiration for your spring planting from growers and club members. More than 70 vendors will be selling plants and gardening products, and there will be a children's craft area. Saturday features live music and garden talks starting at 11 a.m. on organic vegetable gardening, herbs and native plants. Sunday brings a talk on beekeeping at noon. 10 a.m.-4 p.m. Saturday, 10 a.m.-3 p.m. Sunday at University of South Florida Botanical Gardens, 12210 USF Pine Drive, Tampa. $5, 12 and younger free.