Check the local bars (particularly Tank's and Boston's) for pre-parties and mass transit. I will warn you--be sure you've got a designated driver well in advance--the small samples go down quickly and easily and you'll be in no shape to drive.
Here's hoping it doesn't rain again (we're 2 for 3 on thunderstorms since I've been attending). Check this site after the event--I'll do my best to take note. (Here are my notes from last year.)