Nesting Sea Turtles and their Survival: Joe Malo, marine educator at the Clearwater Marine Aquarium, discusses the life histories, habitats and conservation of sea turtles. After the discussion, take a walk to see an actual beach nesting habitat. 6-8 p.m. today. Free. Sandpearl Resort, 500 Mandalay Ave., Clearwater. (727) 512-4914; www.sandpearl.com.
Back to School Pool Party: A back-to-school water bash with DJ music, games, a picnic dinner, backpack raffles, safety tips, after-school program information and literacy promotion. 6-9 p.m. Friday. $2. Highlander Pool, 1937 Ed Eckert Drive, Dunedin. (727) 298-3266.
USTA Tennis Championship: Watch United States Tennis Association players ages 15 and older vie for trophies and prize money in the 25th annual USTA Championship (Designated), sponsored by Guizar Tennis Academy. 8:30 a.m.-8 p.m. Saturday. Spectators admitted free. Total Tennis Center, 2565 NE Coachman Road, Clearwater. (727) 799-3200; guizartennisacademy.com.
Bayhead Action Park Grand Opening: Largo's new skate and freestyle park opens with a ribbon-cutting ceremony, skate and bike demonstrations, DJ music and giveaways. The 7,000-square-foot, lighted park features a seven-foot dry pool, rails, steps, a mini ramp and a grind box. 11 a.m. Saturday. Free. Bayhead Action Park, 375 Seminole Blvd., Largo. (727) 586-7415.
Luau Party: Dress in tropical attire for a party with music, refreshments, prizes and tropically themed art for sale. 12-4 p.m. Saturday. Free. 7 Arches Art Gallery & Boutique, 1248 County Road 1, Dunedin. (727) 724-4278.
Gary "Doc" Welt Benefit Concert/Dinner: A benefit for Tampa Bay resident Gary "Doc" Welt, a retired Navy Seal recently diagnosed with Lou Gehrig's disease, will take place in the Inverness Ballroom and includes a buffet dinner, DJ, live entertainment, cash bar, prizes and a silent auction. Presented by the Silver Strand Foundation. 5-11 p.m. Saturday. Tickets $50 per person. Innisbrook Resort and Golf Club, 36750 U.S. 19 N, Palm Harbor. (302) 584-0688; signup2raceusa.com/silverstrand.
Clearwater Threshers: It's Military Night with a camo bucket hat giveaway and a post-game fireworks display. 6:30 p.m. Saturday. $5-$9.50. Bright House Field, 601 N Old Coachman Road, Clearwater. (727) 467-4467; threshersbaseball.com.
Groove Is in the Heart: Come in costume for this '70s and '80s party featuring raffles and throwback tunes. A portion of the proceeds benefits Big Brothers Big Sisters. 8-11:30 p.m. Saturday. Food and drink specials. Pete and Shorty's, 2820 Gulf-to-Bay Blvd., Clearwater. (727) 799-0580.
RiffTrax Live: Starship Troopers: Michael J. Nelson, Kevin Murphy and Bill Corbett, the stars of RiffTrax, fire wisecracking commentary at the B movie starring giant alien bugs fighting for their survival. 8 p.m. Thursday. $12.50. AMC Woodlands Square 20, 3128 Tampa Road, Oldsmar. (727) 525-7777.
Pitbull Pittie Party: This special promotion helps pit bulls and pit mixes who are slower to be adopted find a home. Adoptions will come with a goody bag of special dog treats and accessories. 9 a.m.-1 p.m. Saturday. $5. Pinellas County Animal Services, 12450 Ulmerton Road, Largo. (727) 582-2600.
Skyway Cat Club Cat Show and Rescue Expo: The All Breed Championship features pumas, Bengal cats, Napoleon cats and Munchkins. Rescued cats onsite and available for adoption. 9 a.m.-4 p.m. Saturday. $6, $3 children, 5 and younger free. Minnreg Building, 6340 126th Ave. N, Largo. (727) 289-1989; skywaycatclub.com.