The now 21st annual WMPG Cajun’ Cookin’ Challenge takes place today at USM’s Woodbury Campus Center (Bedford St., Portland) from noon to 3 p.m. Numerous local restaurants will try to topple last year’s champion, Bintliff’s American Café, by dishing out the tastiest Louisianan eats while the songs of New Orleans play. Free admission. 780-4943. wmpg.org. The party continues at Portland House of Music (25 Temple St., Portland), where the weekly Fat Tuesday celebration of Big Easy music is bound to be extra chubby tonight at 9:30 p.m. Tix: $5 (21+). 805-0134. portlandhouseofmusic.com.