These people seem to be having a good time, and the only fault I can find in their activities is the setting off of a charge in a stump! A lot of fun I know, but in my opinion not something for a group meeting. Too many things can go wrong. Just the same I think this sort of small group/club rendezvous should be encouraged.
This is very similar to a rendezvous we used to hold here in Wychwood Forest many years ago, we had members all over Australia then and we all came together once a year for this rendezvous. It was a lot of fun.