You'd be hard pressed to describe Wellington's recent CubaDupa festival as anything but an outstanding success. Two days of street food, live music, street artists, and throngs of happy attendees. If such a complaint were to be made, it would probably focus on the number of drunk people wandering the streets late at night, and the 'menace' they represent. Jason Krupp is a research fellow at the New Zealand Initiative business think tank and he's been looking into the ways 'vibrant' cities elsewhere in the world handle the tension between nightlife and community concerns.