A friend of mine was in one of the militia troops that had a small cannon used in the re-enactment. The big deal with them was in the weeks running up to the event, when they would all get drunk and shoot the thing off in his back yard. That would be going on right about now, I would guess...
http://www.battleroad.org/
Not far from the Old North Bridge in Concord, there's a tavern just off the village green with a commemorative plaque and lots of detail. Short version: The tavern was HQ for the colonials in the morning, the Brits took it over in the afternoon, and by evening the colonials were in possession again.
Each time, several rounds of libation were consumed, I imagine.