I had pretty much decided on playing an acoustic guitar at the West Fest Woodstock Anniversary event since there was no opportunity to plug in to powered amplifiers.  However, I've decided to take an inexpensive electric guitar and purchase a small pignose amp to go along with it.  Ought to be fun being a totally self-contained electric guitar unit.  I'm hoping to pick up a Marshall amp with belt clip.  It even has a distortion control.  We'll see...