The Creole Cowboys, armed with Cajun fiddles, accordions and guitars, bring Mardi Gras to the Hungarian House (213 E. 82nd St., at Second Avenue; [212] 685-7597, letszydeco.com; $20) on Sunday from 5:30 to 9:30 p.m. Celebrate the approaching Fat Tuesday and six weeks of deprivation with the prerequisite beads, dance lessons (at 4:30 p.m.) and zydeco music from southwest Louisiana.