Last Friday saw the return of Belfast’s Culture Night, and by all accounts it was complete success, bigger than before both in terms of events and attendance. On the other side of the world, in the North-East of Portland, Oregon is a street called NE Alberta Street and on the last Thursday of every March through to October is an art event called Last Thursday. The police shut 15 blocks (about a mile) of the street, and while it is an “organised” event there is no programme of events, no registration for performers. People just turn up and do what…