I know how you feel, you've been given some handy hints here..powders, hats, ponytails , frame of mind etc.
oh no I feel a story coming on.................................. I think I told it already, about possible and how to save water in the dry times
put everything in tiny containers..but main thing is go along , get into it and have fun.
What is the event you are going to? what bands will you see?
I'm sure when you look back it will be a fond fond memory of 4 days of adventure.
try to travel light.......and if you work out how, please let me know.