Monster Jam: Super-sized trucks grunt, groan and roar in side-by-side racing, car crushing and freestyle events. 8 p.m. today, U.S. Bank Arena, $17.50, $6.50 kids. 562-4949.
Celtic fest: Cincinnati Museum Center celebrates St. Patrick's Day weekend with a Celtic Lands Culture Fest full of live music and dance, an Irish marketplace and storytellers. Noon-5 p.m. today, Union Terminal, free. 287-7000.
Library carnival: The Main Public Library hosts an all-day family carnival honoring its 150th anniversary with games, magic, jugglers and tons of books. 1-4 p.m. today, 800 Vine St., downtown. 369-6900.
Top pick: A dozen American country idol hopefuls sing classic country hits on the live telecast of Nashville Star (9 p.m., USA). Judges will eliminate one singer before viewers vote for their favorites by phone.
Critic John Kiesewetter also says he'll watch Saturday Night Live just to see what musical guest Christina Aguilera is wearing when Salma Hayek hosts (11:30 p.m., Channels 5, 22).
Radio highlight: The Metropolitan Opera performs Verdi's La Traviata live at noon on WGUC-FM (90.9).
Birdie doo: So you have a pet bird, you let it out of the cage for some free flight and what happens? Right. Bombs away, usually on the velvet wing back chair. Which is what makes FlightSuits by Avian Fashions such a good idea. The reusable bird diapers keep droppings away from the bird (and velvet wing back chairs) for hours thanks to the one-of-a-kind disposable FlightLiners. Optional upgrades include the leash/harness and a "poop pouch." $19.95 at pet stores and www.birddiaper.com.
24 hours out: Metropolitan Opera pianist Howard Watkins joins forces with violinist Xiang Gao for an afternoon of chamber works by Debussy, plus a rare Chinese piece. 3 p.m. Sunday, Robert J. Werner Recital Hall, University of Cincinnati, $20. 289-4972.
48 hours out: The Alteractive alternative performance series at Playhouse in the Park concludes with a bang when Chicago's sizzling Asian-American comedy troupe Stir-Friday Night does a one-night stand. 7 p.m. Monday, Rosenthal Plaza, $6-$10. 421-3888.
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