NY/NY/CT/PA Driver! The July bash at the Barn...

I'm really pissed now. It doesn't look like I can go. My car had a dead battery earlier today, so I charged it, drove around for a couple hours(had to go to some stores), it seemed fine. I go to start my car tonight, it's dead again. I just charged it again then left it idling for an hour. It measures 14.8-15.0 volts. Is that normal? It's just I'd rather not get stuck over an hour from home with a dead battery. Then again, I could roll it down a hill and pop the clutch to start it...