Best thing to do is to post on every forum even vaguely related to Vegas across the Internet---Of course, response will depend upon where you live and what facilities you can supply for meetings. That's how other have done it so give it a try.
If you know one or more a local Vegas supplier, they may be able to contact customers to see if they're interested.
That's what happened here in Perth W.A. - The supplier even offered to host the first meeting, but we've now outgrown that and are trying a new venue next Thursday.
If you do manage an initial get together, those present will generally be able to give you a list of topics or areas they'd like to cover at future meetings.
I'm in the Pacific Northwest of the U.S. - Oregon to be exact.
Cliff Etzel
Blue Digital Media [ http://www.bluedigitalmedia.com ]
Internet Publishing :: Digital Imaging :: Digital Video
.: a cool visual antidote for a digital age :.
http://www.vegasusers.com/whereareyou/ <-- worldwide vegasusers map. There's also a "user groups" section in the forum there if you want to list your relevant informaiton.