I have to say that you might have a problem in Las Vegas. Reno has a large and active folk community (but no Mudcatters), but Las Vegas is a very strange city. You might try one of the churches - you can often find folkies at Unitarian or Unity or Religious Science churches. Antiwar demonstrations are another good place to meet folkies - and I'm sure you have demonstrations regularly at Nellis Air Force Base and at the Nuclear Test Site at Mercury, and at the Department of Energy headquarters.
The Reno Song Circle is the first Friday of the month - you might drive up.
Click here for Las Vegas Contra Dance information - but note that the Website hasn't been updated in a year.
Good luck.
-Joe Offer, in the Sacramento area-