Mike got back to me. No need to respond. For those interested here's what Mike had to say...

"The quick and dirty on the event:

$45 to be there, $5/day per person BLM trail use fees. We only take cash
or checks since we're not even remotely organized enough to handle
credit cards......."

He goes on to say....

"Whenever you roll in is fine - it's a very loosely organized event. If
you're there, and you want to sign up for trails and hang out, we're
going to get you all set...."

Thanks, Mike, for getting back to me!

-biju.