For my 20th trip to New Orleans and my 8th Mardi Gras, I got to do something I’ve wanted to do for over 20 years:  go to one of those fancy pants black tie balls that the various krewes hold.  And because I believe in coming strong, we chose the biggest one, on its 50th anniversary:  the Endymion Extravaganza.  And I got to go with a couple of my favorite travel companions. Why have I been wanting to go to one of these things for 20 years?  Well,…