Big circles at the Museum Night in Enschede: Roomnacht. A quote:

“What I did at  Roomnight was create a physical environment with equipment (circles, big chalks) in a non-playspace (an avenue for bikes and pedestrians). It was created in an art context – people on their way from museum to museum passed. Totally different crowd than in Amsterdam, many more players. An estimated  50% of all passers-by played.  What I did not do – even when asked – was give any explanation. I gave no narrative, goal or rules. My assistent Laura invited some people to play, and from there on things just rolled, and people took up the game if and as they pleased.”

More info here