I was booked to go in last year and signed the waiver.
In the event I didn't due to the horrendous cross wind, that was my call. If I'd decided to try and had a problem got no issue with that being anyone's fault but mine.
I flew into Staverton instead and tried to get a taxi there-I can echo the point above about traffic, it was diabolical with shambolic organisation. We didn't get there in the end, there were many many disappointed and frustrated people, not helped by the way the organisers dealt with the follow up.
Sorry, I know it was a voluntary event, but just saying as it was.