Florida Beach Halfathon and 5K Race: Both races start the same, with a 5K loop that returns athletes to the start/finish area. A party begins as the 5K athletes arrive, while the Halfathoners will continue their race. Register online. 6 a.m. $60-$80. Fort De Soto Park, 3500 Pinellas Bayway S, Tierra Verde. (727) 347-4440. floridabeachhalfathon.com.
Corey Sunday Market: Food, plants and art. 10 a.m. to 2 p.m. Corey Avenue in St. Pete Beach. (727) 367-3818.
Yoga at the Dalí: The Dalí Museum hosts a class with a view. Bring a mat or towel. Noon to 1:30 p.m. $15 or $10 students/members. 1 Dali Blvd.
Spring Fling: The Gulf Beaches Rotary Club and Treasure Island present a carnival. Noon to 8 p.m. Free admission; rides additional. $18 wristbands. Treasure Island Community Center, Gulf Boulevard and 106th Avenue. (727) 209-4455.
Music Fest by the Bay: Patchouli presents "harmonies of Simon & Garfunkel meet the Gypsy Kings." 1 to 4 p.m. Free. Courtyard at the Bay at the Pier, 800 Second Ave. NE, St. Petersburg. stpetepier.com.
Pass-a-Grille Home Tour: Includes historian Frank Hurley at the Gulf Beaches Historical Museum and art demonstrations at the Don Vista Cultural Arts Center. 1 to 5 p.m. $20. Pass-a-Grille Woman's Club, 2201 Pass-a-Grille Way. (727) 362-8041.
Roadside event for fallen police officers: Liberty Tax Service offers free tax advice, food, a children's bounce house and T-shirts for sale. Donations go to families of three slain officers. 1 to 5 p.m. 3800 66th St. N, St. Petersburg. (727) 345-3026.
'Love, Sex and the IRS': A zany comedy set in the 1970s follows two roommates who have been filing their taxes as a married couple to save money. 2 p.m. $22, $10 students. St. Petersburg Little Theatre, 4025 31st St. S. splt.org.
'Miss Julie': Miss Julie, the daughter of a powerful man, seduces one of her serving men right under the nose of his fiancee. Through April 10. 2 p.m. $20-$47. FreeFall Theatre, 6099 Central Ave., St. Petersburg. freefalltheatre.com.
Rhapsody in Boop: Vocalist and composer Kathy Kosins joins with the Helios Jazz Orchestra to present the best musical moments from Betty Boop films. 4 p.m. $30. Palladium Theater, 253 Fifth Ave. N, St. Petersburg. spcollege.edu/ palladium.
Choral Festival: The local chapter of the American Guild of Organists presents this concert, featuring a choir of 150 voices performing Requiem. 4 p.m. Donation. First Presbyterian Church, 701 Beach Drive NE, St. Petersburg. (727) 822-2031.
The Metalliance Tour 2011: Headbangers ball includes Helmet, Saint Vitus, Crowbar, Intronaut, Howl and Atlas Moth. 5 p.m. $25. State Theatre, 687 Central Ave., St. Petersburg. metalliancetour.com/site.
Third Sunday Comedy and Improv Night: Patrick McInnis stages an interactive comedy hypnosis show. 8 p.m. Pay what you can at the door. American Stage, 163 Third St. N, St. Petersburg. americanstage.org.
Business Startup Basics: 6 to 8 p.m. Free. St. Petersburg Business Assistance Center, 440 Second Ave. N. (727) 893-7146. stpete.org/bac.
Little Sports: Program for 6- and 7-year-olds at Highland Recreation Complex introduces children to a variety of sports. 6:30 to 7:30 p.m. $28 per month with resident card/$35 without. 400 Highland Ave. NE, Largo. (727) 518-3016.
Live Radio Theatre Project: Be part of the live studio audience for this radio show featuring Cuban Bread, a play in 15 scenes set in 1930s Ybor City. 7 p.m. $10, $5 students. Studio@620, 620 First Ave. S, St. Petersburg. thestudioat620.org.
Elder Consumer Law Day: Stetson University College of Law hosts "Protect Yourself From Financial Abuse," focusing on family issues, planning and legal documents. 9:30 a.m. to 2 p.m. at 1401 61st St. S in Gulfport. Free, with a continental breakfast and boxed lunch provided. Registration required. Call Slade V. Dukes at (727) 562-7888 or e-mail him at firstname.lastname@example.org.
Play reading: Philip Hall's Private Proceeding, about a Florida resident who is interviewed about a recent shooting, will be read. A talk with Hall follows. 7 p.m. Pay what you can. American Stage, 163 Third St. N, St. Petersburg. americanstage.org.
Book signing and discussion: A launch for Peter Kageyama's For the Love of Cities. 7 to 8:30 p.m. Free. Studio@620, 620 First Ave. S, St. Petersburg. thestudioat620.org.
Down with diabetes: St. Anthony's Hospital offers free diabetes risk assessments and blood glucose monitoring. 10 a.m. to 2 p.m. In the hospital cafeteria at 1200 Seventh Ave. N.
Water conservation: Learn ways to cut water use and still have a beautiful landscape in this master gardener class. 2 p.m. Free. Registration preferred. St. Petersburg Main Public Library, 3745 Ninth Ave. N. (727) 582-2100. pinellascountyextension.org.
The World We Live In: The Florida Orchestra and Studio@620 collaborate for this night and feature performances based on a theme. 7 p.m. $10. Reservations recommended. Studio@620, 620 First Ave. S, St. Petersburg. thestudioat620.org.