As the others above have stated, it's going to depend on the venue. If you have to provide liability insurance for that event you have two choices. Purchase your own liability policy from an insurance company or you use the AMA's flying site coverage. If you use private insurance you can decide on your own whether you want to require AMA membership for those that participate and fly. However, if you use the AMA's insurance you don't have a choice in the matter, all those flying will be required to be an AMA member.

Or club rents a gym from the local collage once a month for indoor events and we are required to have liability insurance for this. It's much easier to use the AMA coverage than having to hassle with trying to get our own policy.

Ken