Thirty minutes later, after asking students for directions I asked a professor. The (very nice) professor didn't know where it was either, and led me on a brisk walk around the building before she asked someone who knew where it was. As it turns out, the class is in an (unnumbered) Band Hall... but it's not really a music class... Very strange.
On a less rambling note, it has been discovered that the Fruit Bat and I share a Biology class! I'm not sure Flying Foxes and Foxes should really be in the same class (wink wink, nudge nudge) but we are. I still have one more class today, but about an hour before it starts.