The appointment of a temporary guardian is normally reserved for emergent situations that satisfy the discretion of the court. (And that's more than likely the only document that would hold up in a court)
Bear in mind also that having a minor on property without their appropriate legal guardian presents a huge risk to the landowner and those running the event itself.
You may not realize but it's a risk anytime there is a minor at one of these events. Under Texas State Law anything that can be construed as a an attempt to initiate sexual contact IN FRONT of a minor means said parties can be prosecuted as sex offenders. Even people making out in front of a minor COULD be used against them, let's not even think about any pictures.
Then there is the issue of injury. We're burning a 15 foot tall effigy, and some of us will probably be more than a little inebriated at the time.
Let's not forget that we had a small issue at Orfunner regarding an underage teenage (with parents there) and had to eject a person from the event because there where issues regarding sexual whatever...
It all boils down to the what the Freezerburn host decides, and I fully support the steps necessary to protect the landowner, the host, and the volunteers.
There's my unwarranted two cents... Not that it matters for shit. :)
Sorry to be the adult voice too, it's not usually the case...
-Brently
make sure to include a statement about medical decisions in the temp guardian letter.