1 Wild n' Wicked Nights: See the Freak Show starring the Weeki Wachee Mermaids at this annual Halloween festival Friday and Saturday night at the Weeki Wachee Springs State Park. There will be costume and scream contests, hay rides, a pirates quest for the Fountain of Youth, a carnival, a "Final Destination Tour" bus and boat ride, haunted mazes, a haunted forest and a presentation of The House of Horrors by John Leggio. $5 for adults, $3 for ages 6-12. It starts at 7 p.m. both nights at the park, 6131 Commercial Way, Weeki Wachee.
2Pipe Screams: Is that the Phantom of the Opera at the organ for this eerie concert? Well, of course. Listen as several Tampa Bay organists perform creepy holiday favorites on Christ United Methodist Church's Aeolian-Skinner pipe organ (with more than 4,000 pipes!). Costumes are encouraged and there's even singalongs like Deck the Halls with Poison Ivy. Don't leave before the main event: Bach's Toccata and Fugue. It's at 7:30 p.m. Friday at the historic church at 467 First Ave. N, St. Petersburg. Free.
3Halloween Spree: Go trick-or-treating in the Glazer Children's Museum on Halloween night, with bobbing for apples, spooky stories, games, costume parades, and candy and noncandy treats. Sessions are by age: 4 and under 4:30-6 p.m. Monday and ages 4-12 from 6-8 p.m. $5. Registration in advance is requested so they have enough treats to go around. $5. Glazer Children's Museum, 110 W Gasparilla Plaza, Tampa. (813) 443-3861.
4Gothic Graveyard Tour: An educational, nonfrightening tour of the resting place for early area notables including 13 mayors, veterans of seven wars and victims of five yellow fever epidemics. Tampa historian Maureen Patrick appears in elaborate 19th century mourning attire as Miss Prudence Fipwhistle (born 1855, died 1899) telling stories of Tampa's most notorious and prominent residents, religious customs and taboos, and Civil War history. $5 (donation appreciated). Proceeds benefit the Tampa Historical Society. It's at 3 p.m. Sunday at Oaklawn Cemetery, 600 E Harrison St., Tampa.
5Doggy Derby: What's cuter than dogs in costume? Dogs in the pool, that's what. Dogs can dive in and play in the pool Saturday at the Seminole Family Aquatic Center, while they play games and compete in contests for best costume and dog/owner look-a-like. Every dog takes home a swag bag of treats. It starts at 1 p.m. at 9100 113th St. N, Seminole. $5 per dog. (727) 397-6085.
Sharon Kennedy Wynne, Times staff writer