For the past three years, The Unimoogers have been having a similar event. It's called an Annual Shotgun Start event.
They place NEW caches. Teams are formed and each team starts at a different starting point In each cache is an envolope for the individual teams Which contains the CoOrds to the next cache and also a piece of a puzzle Which sends them to the next cache, and so on. When all caches are completed then they return to where ever the event is held and the first team back with all the pieces to a puzzle wins!!!
I may have missed some finer details (I haven't attended one yet).
All the new caches are later approved and available for everyone to find.
Here are just some of the caches from the recent event;
GCYF4B
GCYF4C
GCYF4J
GCYF4H
GCYQDQ
GCYF4G
It sounds like a lot of fun!!!