Somehow, I have ended up running a sportive. And doing the admin for a MTB race, childrens event and family ride the same weekend.
I promise, heartily, to enter non professional events a lot earlier, and to read all of the information they publish online 
Its fun though, and I'm learning so much. And I get to chat with a cycling celeb on Sunday which is very exciting - he's riding the sportive 
But you wouldn't believe the amount of stuff you need! 1500 cable ties just for the signage...