It is the park that has requested the event uses this specific area (so effectively those trails).
The date was then changed/brought forward significantly (don’t know why exactly) and the park Ok’d it.
I don’t know the park reasons for this tbh and wonder if they are just misguided or more sinister. I’m hoping and advising the bhf to make changes.
Also, I think there is a limit of around 200-250 cyclists for events in the dark peak now.