When I was little, the best birthday parties involved ice cream cake, a sleepover and party favors! I had one friend whose Mom would fill them with pillows, trinket boxes from Claire’s, and a sheet of those adhesive earrings where one would stay stuck for hours, but the other would disappear into the tangles of your hair after minutes. Even though party favors seemed to fall out of style during our teenage years, I knew that a bachelorette party had to have…