I commute each day (or at least I did last year and have to do this year 'cause my bf and I have no money for a room and driving is cheaper), so I don't exactly need to worry about packing everything for the weekend. But each evening before commuting the next day, I need to make sure I have everything for the cosplays I'll be wearing with their respective accessories/wigs (was easy last year because I only had one outfit per day, but now I have one or two for Friday and two for Saturday. Make sure I have my wallet (with money), my camera (with working batteries), my car charger for my phone in case it wants to die, and extra batteries for the camera just in case.
I only have one cosplay this year that needs a wig! Thank God...my head hurts and itches after wearing a wig cap and wig too long.