Picnic yard sale sounds interesting. I am not certain as to what it entails, but it might be similar to what we call a "swap meet". People bring along vintage car parts, bric a brac, all sorts of interesting rubbish, and others come, from miles around. Stall holders pay a small fee and everyone has a wonderful time, searching for their dream item. Maybe there is a possibility for such an annual fund-raising event at the WWF Ry? Probably selling food is where the real profit arises, as usual.