I must admit I quite like the sound of this creative arty crafty farty idea!!

I know we are now sadly entering the time of year with the weather changing, ie autumn, but have you maybe considered the idea of maybe doing something 'arty' in an open space?
I've never used spray paints, so the idea of getting local council permission to get creative on a blank wall sounds interesting, but probably I am talking out of my league here?
A sort of 'organised' graffitti? Where a few people can be creative on a blank wall, perhaps?
Or maybe some 'street' art? Using materials that will wash away, so non permanent, but would still enable folks to get creative, say maybe on the paving slabs somewhere? An area of the sea front maybe? ( Chalks and kids washable poster paints?)
Or there might be a community hall or church hall willing to let a group of responsible people use to express themselves creatively?
I like the idea of non directive art, ie no restrictions or limitations. Formal art classes tend to be so formal and restrictive dont they?
This is a great idea cyclegirl. I hope it takes off!

PS: Just re read your original post 'Cyclegirl' and see you wanted evenings, so I guess an indoor thing is best, considering the time of year.