1) Teenagers - to keep them busy and happy they need an earner. Despite your parenting most 14-year-olds are complete capitalists who have no qualms about putting 100% profit onto the cost of a pot noodle.
2) Toddlers - no matter how many clothes you pack for a three-year-old prepare to be rubbing the dried mud off Friday's tights by Saturday evening. A helium balloon of choice (in our family it's usually batman) tied to the back of a toddlers dungarees can help to prevent the panic of a lost child at a busy festival (rope could even be lengthened at larger venues!)
Drum into children that they must not purchase chocolate cake /truffles off anyone, especially if salesperson is barefoot!
Finally remember there is no such thing as a free lunch. Arranging to work at a festival may seem like a shrewd money saving option, however there is nothing more depressing than wearing a stewards waistcoat and being 3 fields away from your friends/family who are probably down the front at the main stage.

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