Niall Horan: The One Direction singer-songwriter on his own tour brings along countryís Maren Morris. 7 p.m., MidFlorida Credit Union Amphitheatre, 4802 U.S. 301 N, Tampa. $29.50-$107. (813) 740-2446.MegaCon Tampa Bay: The multi-genre convention brings a lineup of celebrity guests and comic book creators; hundreds of vendors selling art, toys and memorabilia. Today brings Gotham stars David Mazouz and Sean Pertwee to discuss the show and the caped crusader at 12:30 p.m. in Ballroom B and C. C. Get a free pass for kids at megacontampabay.com. Opens at 9 a.m., Tampa Convention Center, 333 S Franklin St., Tampa. $25-$89; $10 children age 6-12 (free with online coupon); 5 and younger freeSmithsonian Museum Day Live: Museums across the nation partner with the Smithsonian to offer free admission for one day. Among them are Florida Holocaust Museum, Leepa-Rattner Museum of Art, the Museum of Fine Arts, the Imagine Museum and the Ringling Museum of Art. The Dali museum offers free admission to Pinellas County residents only. Non-residents who pay for a ticket that day get a voucher to return for free. Museum hours may vary. To receive your free ticket, go to smithsonianmag.com/museumday.The Play: Pittsburgh Steelers legend Rocky Bleierís one-man-show tells the story of the four-time Super Bowl champís life. 3 and 8:30 p.m., Ferguson Hall at the Straz Center for the Performing Arts, 1010 N MacInnes Place, Tampa. $45-$65. (813) 229-7827; strazcenter.org.Tampa Bay Boat Show: This three-day sales event features the areaís top boat dealers/manufacturers, the latest in boating and fishing supplies, and accessories. Plus, thereís a series of one-hour talks from 11 a.m. to 3 p.m. today for the Florida Fishing School Seminar Series. 10 a.m., Florida State Fairgrounds, 4802 U.S. 301 N, Tampa. Free.TFO on the Go: Reed Trio : The Florida Orchestra presents a blitz of community concerts all over Tampa Bay to celebrate the beginning of TFOís new season. Features Jeffrey Stephenson on oboe, Joseph Beverly on clarinet, and Maurizio Venturini on bassoon. 12 p.m., Dunedin Fine Art Center, 1143 Michigan Blvd., Dunedin. Also at 3 p.m., Leepa-Rattner Museum of Art, 600 Klosterman Road, Tarpon Springs.Denying Gravity: SAGES presents the comedy that raises fall prevention awareness for seniors. Come early at 1 p.m. and find information on fall prevention services and products. 2 p.m., Coliseum, 535 Fourth Ave. N, St. Petersburg. Free. (727) 892-5202; stpete.org/coliseum.Chicago: The Tony-Award winning musical. 2 and 8 p.m., Carol Morsani Hall at the Straz Center for the Performing Arts, 1010 N MacInnes Place, Tampa. Start at $31. (813) 229-7827; strazcenter.org.Backward Pub Crawl: Wear Prohibition era attire and join author Ben Montgomery for a backward pub crawl to celebrate his new book The Man Who Walked Backward: An American Dreamerís Search for Meaning in the Great Depression. 4 p.m., The Hub, 719 N Franklin St., Tampa. Free (food/drink additional). (813) 310-6066; hubbartampa.com.Mike E. Winfield: Heís appeared on Comedy Centralís Live at Gotham and on BETís Comic View. 6 p.m., Side Splitters Comedy Club, 12938 N Dale Mabry Highway, Tampa. $10-$16.50. (813) 960-1197; sidesplitterscomedy.com.Ski Mask the Slump God: South Florida rapper and new member of XXLís Freshman Class will perform on his Ski Meets the World tour with Badhunta Izzy, Danny Towers and DJ Scheme. 7 p.m., Ritz Ybor, 1503 E Seventh Ave., Tampa. $27.50-$75. (813) 247-2555 .ritzybor.com.Improv Night: 7:30 p.m., American Stage Theatre Company at Raymond James Theater, 163 Third St. N, St. Petersburg. $10 advance, $15 at the door, $8 ASI students. (727) 823-7529; americanstage.org.Scream-A-Geddon: Brace yourself for this one. The interaction meter goes off the charts at this Halloween haunt this year with the addition of Rage 3D, Demonís Revenge and Zombie Paintball Assault in which you literally hunt, shoot and kill zombies. 7:30 p.m., Scream-A-Geddon, 27839 Saint Joe Road, Dade City. $19.95-$39.95, $9.95-$19.95 paintball. (813) 452-5412; screamageddon.com.Howl-O-Scream at Busch Gardens: Get spooked by six haunted houses and scare zones and the chance to ride coasters in the dark, sometimes with a zombie sitting next to you. Includes early access to the park at 5 p.m. and remains open until 1 a.m. 7:30 p.m., Busch Gardens, 10165 N McKinley Drive, Tampa. $39.99 and up. (813) 884-4386; howloscream.com/tampa.Gary Owen: In addition to numerous comedy specials on Showtime and Starz, heís appeared in the films Think Like a Man, Ride Along. 7:30 and 10 p.m., Improv Comedy Theater, 1600 E Eighth Ave., Tampa. $27-$30; $40 VIP. (813) 864-4000; improvtampa.com.City: Fashion + Art + Culture: The worlds of high art and fashion collide in this swanky event with a runway show, heavy hors díoeuvres, an open bar, live entertainment and dancing. 8 p.m., Tampa Museum of Art, 120 Gasparilla Plaza, Tampa. $150, $275 VIP. (813) 421-8370; tampamuseum.org.The Fantasticks!: Opening Night: The worldís longest running musical features the classic song, Try to Remember. Through Oct. 21. $25-$50. 8 p.m., Freefall Theatre, 6099 Central Ave., St. Petersburg. $23-$50. (727) 498-5205; freefalltheatre.com.Mike E. Winfield: Heís appeared on Comedy Centralís Live at Gotham and on BETís Comic View. 8 and 10:30 p.m., Side Splitters Comedy Club, 12938 N Dale Mabry Highway, Tampa. $10-$16.50. (813) 960-1197; sidesplitterscomedy.com.KIDS AND FAMILYSunset Cinema at Pier 60: Bring blankets or low lawn chairs to watch Life of the Party (PG-13) on a jumbo sized screen. No alcohol. Shows start around dusk. 7:45 p.m., Pier 60, 10 Pier 60 Drive, Clearwater Beach. Free. (727) 449-1036; sunsetsatpier60.com.People and Pets Food Drive: Bring in a non-perishable canned food item, or wet or dry dog and cat food and receive discounted admission to the aquarium. 10 a.m., Clearwater Marine Aquarium, 249 Windward Passage, Clearwater. $12.99, $9.99 kids 12 and younger, 2 and younger free. (727) 441-1790.Float In Movie:: Bring a float and enjoy games, trivia, concessions and watch 1993ís Hook in the pool. 7 p.m., Highlander Pool, 1937 Ed Eckert Drive, Dunedin. $5, kids 2 and younger free. (727) 298-3266.TO WATCHThe Shape of Water, 8 p.m., HBO: The film that won the Oscar for best picture earlier this year makes its television debut. A dark fantasy, it focuses on a mute cleaning woman working in a secret government lab in 1962. There, she befriends an otherworldly, aquatic creature being held there against its will.MORE TO EXPLOREFind things to do with the kids at tampabay.com/things-to-do.