Sandpoint, Idaho would be a an interesting 'outdoors' convention, but it is inconvenient from a travel standpoint. The closest airport is not Boise, but Spokane, WA. Most of the flights are to/from Seattle, WA and Portland, OR, with very limited service from anywhere else in the US, so folks would have to make 2+ transfers. Car rentals would be a requirement.
I encourage anyone scheduling something in Finland to pick the time that is best for them. You know your local area the best. Don't fight the timing, pick the time that's right for you.