Fringe?

Spotted this sign on my way home from the allotment - dunno what it's about. On the other side of the sign (which makes it clear it's venue 470, in case you are moved to look it up!) it just says "Keep Walking".

Very depressing to find we'd had a new ingress of the rats into the shed - first time I've seen a trace of them for many months. Maybe due to a change in the weather.