From the campaign email:

Please join us Wednesday, September 17th, for a rally with Barack Obama in Las Vegas:

Change We Need Rally
with Barack Obama

The Baseball Stadium at Cashman Center
850 Las Vegas Blvd. North

Wednesday, September 17th
Doors Open: 2:30 p.m.
Program Begins: 5:00 p.m.

The event is free and open to the public; tickets are not required but an RSVP is encouraged. Space is available on a first come, first served basis. Please RSVP using the form to the right.

For security reasons, do not bring bags and please limit personal items. No signs or banners permitted.

You can RSVP on the official site. Also, the first of four debates (three presidential, one VP), takes place September 26th. Those are gonna be fun.