Tampa Bay Frogman Swim: Wimps should stay home for this one. Here's a 3.1-mile open-water swim off the shore of Gandy Beach in the 58-degree waters of Tampa Bay. Swimmers must have some degree of open-water experience or competitive long-distance pool experience. Wetsuits are required except for swimmers training to cross the English Channel. Meets and departs from Gandy Beach east of the Banana Boat. Benefits the Naval Special Warfare Foundation. 6 a.m. $35 and $1,000 in donations appreciated. Banana Boat, 13090 Gandy Blvd. N, St. Petersburg. (727) 570-2996. tampabayfrogman.com/event.html.
Miniature Train Rides: Kids of all ages can ride the miniature trains of Largo Central Railroad. 10 a.m. to 4 p.m. Free (donations for train maintenance appreciated). Largo Central Railroad, 105 Central Park Drive, Largo. (727) 587-6775. lcrailroad.com.
Music Fest on the Water: Relax by the water and enjoy live music in the Pier's music series. This portion features the Arch. 1 to 4 p.m. Free. The Pier, 800 Second Ave. NE, St. Petersburg. (727) 821-6443.
Holiday Lights in the Garden: Today is your last chance to stroll through a garden of tropical plants glowing with more than 500,000 twinkling lights. 5:30 to 9:30 p.m. $2 suggested donation, 11 and younger free. Florida Botanical Gardens, 12211 Walsingham Road, Largo. (727) 582-2100. www.flbg.org.
Pinellas Park Civic Orchestra: An evening of light classical and pops music with vocalists. 7:30 p.m. Free, donations accepted. Pinellas Park Performing Arts Center, 4951 78th Ave. N, Pinellas Park. (727) 397-3832. pinellas-park.com.
'School for Nerds' Auditions: Open auditions for School for Nerds. St. Petersburg Petite Little Theatre is open to all children ages 8 to 14. 3:30 to 5:30 p.m. Free. St. Petersburg Little Theatre, 4025 31st St. S, St. Petersburg. (727)864-2950. www.splt.info.
Mini Trade Show for Seniors: The Dove 105.5 FM will host this mini trade show that will feature live entertainment, free health screening, senior-friendly vendors and prizes. 10 a.m. to 2 p.m. Free. Tyrone Square Mall, 6901 Tyrone Square, St. Petersburg. (727) 347-3889. simon.com/mall/default.aspx?id=135.
International Film Movement: This portion of the International Film Series features the 73-minute G-rated film Alamar. In the film, a young man of Mayan roots and Natan, his half-Italian son, embark on an epic journey into the open sea to understand his heritage of a fisherman's life. 4 p.m. Free. Gulf Beaches Public Library, 200 Municipal Drive, Madeira Beach.
Florida Orchestra Coffee Concert Series: The annual coffee concert series features a variety of classical music mornings served with strings, wind, percussion and a side of doughnuts. "St. Petersburg, Russia: A Musical Tour," kicks off the three-concert series with Tchaikovsky's Polonaise from Eugene Onegin, Shostakovich's Tahiti Trot/Tea for Two and Prokofiev's Balcony Scene from Romeo and Juliet. 10 a.m. $24-$42; package deals for three-concert and seven-concert series available. Ruth Eckerd Hall, 1111 N McMullen-Booth Road, Clearwater. (727) 892-3337. floridaorchestra.org/coffee-series.asp.
The Florida Orchestra at the Studio@620: A Surreal Surprise: "An Intimate Collaboration II: The World We Live In," is the second season for a series of seriously fun happenings by the Florida Orchestra. Seating is limited; it's a good idea to reserve a seat in advance. First up: A Surreal Surprise, with a special performance of Party Pieces: Sonorous and Exquisite Corpses, plus a performance from Nine Surrealist Studies (After Salvador Dalí) No. 3. Also on the program, readings from Little mi-ma Monsterlet and Frankenstein. 7 p.m. $10 suggested donation. Studio@620, 620 First Ave. S, St. Petersburg. (727) 895-6620. thestudioat620.org.
Largo's Downtown Market (formerly Largo Harvest Marketplace): Produce, flowers, plants, baked treats, handcrafted items and more. 9 a.m. to 2 p.m. Free. Ulmer Park, 301 West Bay Drive, Largo. (727) 587-6740, ext. 5015.
Treasure Island Market: An open-air market in Community Center Park. 9 a.m. to 2 p.m. Treasure Island Community Center, Gulf Boulevard and 106th Avenue, Treasure Island. (727) 360-4121. treasureislandchamber.org.
Florida Orchestra Pops: The One and Only Louis Armstrong: Byron Stripling, star of the hit musical Satchmo: America's Musical Legend, relives the music of Louis Armstrong. Stripling plays such hits as Sweet Georgia Brown, Honeysuckle Rose, Ain't Misbehavin' and more. Jeff Tyzik is guest conductor for the performance. 8 p.m. $20-$67. David A. Straz Jr. Center for the Performing Arts, 1010 N MacInnes Place, Tampa. (813) 229-7827. strazcenter.org.