Refresh on Guests?

What are the rules for guests? My dad and a friend (tenative) would like to come down.

Dad will be driving:
YJ, 4" lift, 33's. Everything else stock.

Friend:
Toyota, 38's maybe 40's. He would really like to run Upper Helldorado at the same time. Here is a link that has some older pics and info about the toy.
http://www.powerplantweb.com/Toyota.htm

Anyway, what do I need to do to get approval and what needs to be done to for registration if they can attend.

Thanks,
Lincoln

Guests, as usual, are welcome. Bring 'em awn!

Thanks Richard. Now I just need to get my crap together. I told the wife I think I should get my high steering done before we go. She asked why don't I wait a few weeks before starting.