I just checked the website and yes, there are tours once a month but it is a process. Everyone must submit to a background check. You must bring your own food and drink. No cameras, cell phones, lap top computers or any recording device. Dress is comfortable, no shorts and sturdy shoes. Everyone meets at the Atomic Testing Museum. Tours are by bus and run from 7:30 AM to 4:30 PM. The tour date for next June doesn't coincide with the convention, but if there are enough people interested in going we can request a date and go as a group.
Here's a link to the site... http://www.nv.doe.gov/default.htm