There are several active black powder clubs in Wyoming all of which are under the
Wyoming Muzzle Loaders Association.
Two clubs that I'm aware of that have monthly shoots are: Deer Creek Muzzle Loaders and Wind River Muzzle Loaders. Deer Creek holds a monthly shoot on the first Sunday of each month and Wind River shoots the second Sunday of each month.
Deer Creek shoots close to Casper (Natrona County) and Douglas (Converse County) Wyoming and usually sponsors a couple State sanctioned shoots each year.
Wind River covers Fremont County (Riverton and Lander) which is the location of the 1838 Rocky Mountain Fur Company Rendezvous. They sponsor an annual rendezvous usually in the first week of July. That web address is:
1838 Rendezvous
The Statewide organization is Wyoming Muzzleloader Association, linked below. If anyone wants any information let me know and I will do what I can to help.
Wyoming Muzzleloader's Association Link: