There is a company putting together a boxing fan expo for Cinco De Mayo weekend at the Mandalay Bay. I've emailed them for more info about what exactly is the focus but it looks like they are trying to bring in lots of fighters for autograph sessions and have a trade show. Admission is pegged at $30 for the one-day event with a charity component, but it could be a lot of fun, especially if they can recruit a nice group of guests. Here's the web site:
http://softmedia.tv/index.asp?id=1001&lang=EN
I hate the Mandalay Bay but I am considering booking a nearby place and attending since it is drivable for me.