The Davis Square "guerilla contra" collection

For a few years now, Jeff Kaufman has been the ringleader of an informal "flash mob" style contra dance in Davis Square, Somerville, Massachusetts, USA, on random evenings when good weather is predicted. They are only organized a few days ahead of time, for weather reasons. Calling and music are provided by whoever shows up. Email is sent to a lot of the "usual suspects", and there's a facebook page" for the event. This is an unofficial list of the tunes that are likely to be played, though this depends a lot on whatever musicians are present.
Some tools to do useful things in directories with .abc tune files:
Session listerCollection listerTune lister