Hot Chelle Rae: The Nashville pop group has gained national fame thanks to singles Tonight Tonight and I Like It Like That. They perform with Electric Touch at 7 p.m. at State Theatre, 687 Central Ave., St. Petersburg. $16-$19. (727) 895-3045.
GreenFest: Find out what's new for your garden and good for the environment at this nature and plant festival, with guest speakers, gardening and landscape demonstrations, numerous vendors, kids' activities and food for sale. It begins at 9 a.m. at Henry B. Plant Park, 401 W Kennedy Blvd., Tampa. $3 donation, free for kids 12 and under. (813) 254-4950.
Bloom N Garden N Chalk Festival: Stroll Main Street as artists create sidewalk chalk masterpieces and find an array of plants, flowers, herbs, garden art, birdhouses and more for sale. Also features workshops and live entertainment starting at 9 a.m. along Main Street between Bayshore Boulevard and Eighth Avenue in Safety Harbor. Free. (727) 724-1572.
Circus Sarasota and Key Chorale: Cirque des Voix: Tino Wallenda and members of the celebrated Flying Wallendas defy gravity while the orchestra performs John Williams' The Lost World in this show that combines the thrills of circus performers with choral music. Look for jugglers, comic artists and the debut of Sarasota's Sailor Circus students' Hand Balance act at 4 p.m. at Palladium Theater in St. Petersburg. $10-$45. (727) 822-3590.
SERIES FINALE Luck, 9 p.m., HBO This was just supposed to be the end of the first season, but then three horses died while filming this racetrack drama, so no more Dustin Hoffman for you.
SEASON PREMIERE Mad Men, 9 p.m., AMC Welcome back for another season of retro anxiety, backstabbing and anachronistic trivia, which the media gushes about but is really watched by an eighth as many people as Jersey Shore. That proves it's a good show.
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