re: Jazz Fest - Brigtsen’s, Clancy’s, or Gautreau's?

To add to the back up suggestions, you might look at La Petite Grocery as well.

Another suggestion is Ye Olde College Inn. We have enjoyed every meal there. It's also pretty lively and would fit your atmosphere needs, though it's not terribly intimate. It's more along the lines of fun to me.

You should make a reservation now wherever you can and then you can give Clancy's a try on the given date.