Here's the tourism website for NOLA, they have the calendar of events for things to do
New Orleans Online - Things to Do in New Orleans
Seafood Fest the 11-13th
NOLA Film Fest 10-17th
Crescent City Blues & BBQ Fest 18-20th
Oktoberfest every weekend in October
Not to mention Harrah's if you like casinos, Saints football in the Dome !! (and LSU football), French Quarter and open air French Market has nice shopping, etc...