No need to belong to a club
But most require good faith efforts of participants to be kinda close too olde tyme' style dress,,ie: bedroom slippers are better than Nike' cross-trainers,,bald is better than baseball caps,,,the cell-phone is best set just "on" and left in the truck,,PM's,IM's and Voice-mails can be answered later. No "T" shirts or "tank" tops,,No plastic stuff,,Bottled water,soda-pop,beer,,just pour it in a cup discretely prior to consumption."tin cup rule".
Now notice I said "participants". Anyone can go to a vous'. And welcome. All most all I know, have a place for modern camps beit trailer, motorhome,pick-up toppers,pop-ups or modern tents and gear just outside the actual vous' site for those that want to be there and have fun.
Heck! just go! ask for a feller called "booshway" :-D chances are if you arn't set-up proper too "participate",,,someone will loan' you the gear you need so ya can
I remember my first one,,I e-mailed the guy!! told him I ain't got no clothes proper,,and I asked if I could shoot with'm all just this one tyme with-out,,just ta see what it's like to shoot with a group of trad BP shooters. He said OK, just once. That was a May. June, I went to another with my modern tent, a drop sleeve shirt and painters pants with the pockets cut off!. In August (all the same year) I had my first canvis A frame,,,,,,,now I have 6 gun's,,two tents, a "full-size" truck,,buckskin,,Elk hide, buffalo mocs',,(bead-work on allot of it!) and have been seen polishing old horns from cows and peeling bark from Lodgepole pines!