Guavaween: The G-rated version before 3 p.m. is free and has trick-or-treating throughout historic Ybor City. Later the party people take over, with the Mama Guava Stumble Parade at 8:30 p.m. along Seventh Avenue. Tickets are $17 at the gate.
The Glow Show: The galleries in the 600 block of St. Pete's Central Avenue put their own twist on Halloween. At Bluelucy Gallery, everything will be awash in black light; at Pale Horse Design, pose with monster-inspired photo standups; and at Collective, explore pipes as art, with live glass-blowing. Free, 7 p.m. For Halloween events, see tampabay.com/things-to-do.
Florida Orchestra: Pops season opens with Time for Three — two violinists and a double bassist who play a mix from bluegrass to Bach. Show is 8 p.m. at Mahaffey Theater in St. Petersburg and 7:30 p.m. Sunday at Ruth Eckerd Hall, Clearwater. $20-$67. (727) 892-3337.
Fall Paddle Festival: Stand up and paddle in team and individual events. Registration starts at 10 a.m., race starts at noon at Postcard Inn, 6300 Gulf Blvd., St. Pete Beach.
Circus McGurkis: The annual peace festival and people's fair has art, musicians, dancers, kids' activities and new this year is a modern day slavery exhibit and hourly yoga. It's 9 a.m. to 4 p.m. at Lake Vista Park and Center, 1401 62nd Ave. S, St. Petersburg. Free.
KIDS AND FAMILY
Yo Gabba Gabba: Funky animation and catchy songs give it a retro psychedelic vibe that appeals to 4-year-olds, college kids and parents. Two shows at 2 and 5 p.m. at the St. Pete Times Forum in Tampa. $28.75-$48.75. (813) 301-6500.
Saturday Night Live, 11:30 p.m., NBC: Jon Hamm and Rihanna team up for probably the most smokin' hot episode of the season.
Celebrity Ghost Stories, 9 p.m., Bio: They've been saving this one for Halloween: Daryl Hannah, Maksim Chmerkovskiy, Shanna Moakler and Marilyn Manson. When a guy from Dancing With the Stars is a headliner, it's got to be scary.
MORE TO EXPLORE
A new restaurant opens near the St. Pete Times Forum in Tampa. Catch up on the dining scene at tampabay.com/things-to-do.