Well - its Montana! and it's October... Dress in layers and bring your dancin shoes!
There could be snow in the mountains but there shouldn't be at the venue. Don't quote me though, it did snow before halloween last year!
Actually there is an option to camp at the venue! Be sure to go to the travel page of this site for more information.
We do! Check out the Registry Page - But please do not feel obligated. We just want to have everyone there to celebrate the beginning of the rest of our lives together! Cheers!