So we all know how much I love Cambridge…this blog is practically a paean to my home city. Here I present you with reason #742 that Cambridge is great: The annual City of Cambridge Dance Party. That’s right, a dance party, right in the middle of the city. They close down Mass Ave, crank the tunes, break out the glow necklaces and get the strobe lights going, and thousands of people dance the night away right in front of City Hall. If this isn’t an urban amenity, I don’t know what is. Does your city or town have a large public festival like this? What creates the conditions for something like this to occur? And if you plan it, how do you know people will come? What makes a public event like this a success?