The only regulations for this event was the chairman (ME)- and now that you have opened this up - I appreciate your OFFERING TO RUN THE YEAR END CHALLENGE. You will be great it. I noticed how you so cleverly offered to do it better for that event and I for one KNOW YOU WILL REALLY DO IT GREAT! 
I chose (my Co-Chair went along with me) a 3PM open and a 5PM start to allow for a min. of 3 runs - and fun runs - we stopped a little after 11PM when we realized the "fireworks" we were seeing was actually lightening. I really started out thinking we would have 50 people show up and get 4-5 runs - but then we got a whopping 78 - which meant we had to get it all done before dark - including a challenge. All this without some "core" members to help. I chose not to even run, as I was too busy with announcing (we missed you on that very much Nick) and making sure watermelon was cut up, soda was cold and auction was moving along. (Thanks to John, April, Carla, Dave, etc)
In hindsight, might have said to start earlier, but we had the course set up crew there at 1pm - with many of us right behind them. I waited for the last competitor to finish getting their tires changed and left GIR at close to midnight. Lynn was right there with me so he and I were there for almost 12 hours.
Nick, I really agree it might have been fun to start much earlier and run a real marathon, but it was along long day and hated to tax the organizers for many more hours. Loading that trailer at 11PM was hard, and thanks for the 10-12 people who picked up and pitched the cones in or they might still be on the lot.
Not trying to be a smart a** - (any more than I think you were) but that was a long day, not including the time it took to get ready for it.
Nick, I am serious, please do follow through with chairing the year end event - you will make it fun for all, I know you will.
Jan Rick
Make it Easy - Make it Fun!
Don't take life to seriously, no one gets out alive anyway.
www.soloperformance.com