Most importantly, comfortable shoes. As far as clothes are concerned, most attendees generally choose casual and comfortable. Remember you will be coming home with a lot of new toys, so you want to have plenty of room to safely get your new stuff home in your bag. If you have a rolling bag, that is the perfect accessory for a convention. Pack the supplies that are needed for your classes.
Most classes require adhesive, scissors, a black journaling pen, and a ruler.
Remember to bring along a pad and pencil to take notes. This is a great opportunity to meet other women who share your enthusiasm. Many scrappers bring completed albums to share. Bring your camera along and take photos of pages that you would like to recreate in your album. The best advice for completing pages at a cropping party is to do your homework.