One more comment to delay:
This sentence appeared in the very discussion that I posted:
[QUOTE]Your participation in the event is essentially tantamount to releasing your image into the public domain.[END QUOTE]
As long as that is made clear to all participants, no photographer can be accused of practicing voyeur photography.
It would be interesting to consider if this, in fact, makes the bikers actually "models". Anyone....?

Does there need to be an actual, signed contract?
Klondike