Mercedes isn't going to forget an invitation, especially not one to be fed. She even gussied up a little for the occasion - wearing a bit nicer clothes than usual, let her hair go loose, and seriously considered putting on makeup. (She didn't, but she thought about it. She figures she gets brownie points for that.) 

At around 7:30(ish) as directed, she shows up at the room Anita told her to go to, examines the door with a bit of trepidation, and knocks. After all, compared to dealing with a pack of overprotective werewolves, how hard can a dinner party with a friend and her fiancee be? Small potatoes. Or it should be.

She gulps, just a little.