Oh, that's easy! I was baking cupcakes! It was the day after the Grand Galloping Gala, and even though we ended up having a really REALLY fun night all by ourselves I thought everypony might still be a little disappointed by what a totally boring party it turned out to be, so I thought I'd throw a This-Is-Totally-Better-Than-The-Gala-Anyway Party! Hey, maybe once everypony else gets here I'll throw it for real! After the giant welcome party, of course, that has to come first!