1. National Train Day: Started by Amtrak in 2008, this celebration at train stations and museums across the country is held on the Saturday closest to May 10, the anniversary of the completion of the United States' first transcontinental railroad. Tampa's Union Station will be filled with model train displays, with the H.B. Plant Railroad Historical Society on hand as well as the Suncoast American Flyer Enthusiasts, historical exhibits and the Tampa Firefighters Museum's fire engine No. 42, nicknamed "Little Mack." It's all free 10 a.m.-4 p.m. Saturday at Union Station, 601 N Nebraska Ave., Tampa. (813) 445-3493.
2. Hurricane Expo: Tampa's Museum of Science and Industry will offer an admission deal as kids play while parents learn about preparing for hurricane season. There will be sports-related games set up by the Buccaneers, Lightning and Rays; and a touch-a-truck with emergency vehicles. For the adults, there will be safety demonstrations, educational displays and national expert Phil Klotzbach to answer visitors' questions and share his insights. Parking and admission to the expo are free 10 a.m.-4 p.m. Saturday, and there's $5 admission to see the museum's 450 hands-on exhibits (normally $26.95 for adults) until 6 p.m. at 4801 E Fowler Ave., Tampa. (813) 987-6000.
3. Water Ski Show: The Tampa Bay Water Ski Show Team is putting on free shows at Tower Lake in Oldsmar every Saturday through October. The team of some 45 performers won the Southern Regional Show Ski Tournament in Sarasota last June for its space-themed show "Galax-Ski Quest." For the next three weeks you can see "The Sequel" with pyramids of wild-wigged aliens from Planet Nova. The entertainment begins at 5:30 p.m. Saturday with a preshow, and the regular show is at 6 p.m. at Tower Lake, 130 Burbank Road, Oldsmar. (813) 917-8354.
4. Static Flow Opening Reception: The Duncan McClellan Gallery in St. Petersburg is opening an exhibition of visiting artist Zac Gorell, who has worked at the prestigious Corning Museum of Glass and taught glassblowing in Taiwan. He will give a glassblowing demonstration at 6 p.m. Saturday, the Henry Ashwood Jazz Project performs from 8 to 10 p.m., and there will be a cash bar and a food truck. The exhibition remains on display through June 6 at the gallery, 550 24th St. S, St. Petersburg. Free.
5. SciCafe: The Dalí Museum's conversation series about science for adults this month wins best lecture title: "Swinging Ain't Just For Monkeys: Monogamy and Polygamy in the Animal Kingdom." Moderated by Rob Lorei, news director of WMNF 88.5-FM community radio, the event is free but RSVPs are requested at (727) 803-9799, ext. 201, or firstname.lastname@example.org. Doors open at 6 p.m. Tuesday and discussion begins at 6:30 p.m. in the museum's community room at 1 Dalí Blvd., St. Petersburg.