Watch 12 chefs prepare Gulf seafood for the top honors Saturday at the 14th annual GREAT AMERICAN SEAFOOD COOKOFF, 11:30 a.m. at the Ernest N. Morial New Orleans Convention Center. $10.

More than 20 galleries and museums open fall art shows Saturday at WHITNEY WHITE LINEN NIGHT, 5:30 p.m. to 9:30 p.m. with music, cuisine and cocktails in the 300-700 blocks of Julia Street. Don’t miss the afterparty at the Contemporary Arts Center.

Trumpeters Nicholas Payton, Wendell Brunious, Kermit Ruffins and many more celebrate the legacy of Louis Armstrong at the three-day SATCHMO SUMMERFEST, Friday-Sunday at the Old U.S. Mint, 400 Esplanade Ave. $5.