Mommy's first night out

So I've pretty much been house-bound since LO's arrival (I.e unless it's a family outing, I'm at home) and on Saturday DH went to a all-day nerd tournament...and promised me a night out by myself in return. So I decided to go to a concert...alone. Apparently, going to a concert alone not only sucks, but I'm watching everyone drink and I reeeeeally want one, but I don't want to be one of those "alone and drunk" girls.
DH went to a movie, and MIL is watching the little one...it's been almost 2 hours since we left the house and I'm tempted to call and check in on LO