Fat Tuesday fell on Feb. 5 this year, and since that was Super Tuesday, you were probably too busy exercising your civic duty to celebrate. Luckily, it’s not too late. Head over to Symphony Hall for a MARDI GRAS CELEBRATION courtesy of the Atlanta Symphony Orchestra and the Side Street Strutters, an outfit specializing in early New Orleans jazz, Dixieland and Big Band sounds. Everyone who shows up gets complimentary Mardi Gras beads, to boot. And if you can’t make it tonight, there’s another show on Saturday. Tickets range from $20 to $62. 404-733-5000. www.atlantasymphony.org.