Since this is an event, I'd recommend one of the old line Creole restaurants -- Antoine's, Galatoire's, Broussard's, Arnaud's -- although I certainly couldn't argue about Commander's Palace. The jazz brunch at Court of Two Sisters is different and quite nice. K-Paul's, if you want to go to the place that started the blackened redfish craze.
Check on-line menus but understand that many menus change daily. Still, you'll get an idea of what to expect. Check for dress requirements. Some require a jacket.
Where will you be staying?
Edit: Here's a list of restaurants that Quarter House has on the reception desk. Not all are "event" places but you can eat well at any of them. Most anyone who has been to N.O. has a favorite that is not on the list. (We went four times in one week to Mr. Ed's, which is not on the list. We have dined many times at Oceana Grill but never made it there on the last trip.)