Confusion...

So i am supposed to go to this etiquette luncheon for portfolio prep, and was under the impression that it was today at 11:30...but the reminder e-mail they sent me says that it is tomorrow at 11:30 which is stupid becasue i have class at 12! Although i would not mind missing com law, i am thinking it is probably not a good idea. So here i sit, confused...and wondering which is correct, my original thinking or this blasted e-mail...i will now try to retrieve my receipt with the original information.