From what I can make out it's only the chosen volunteers ("Games Makers") who are required to not post details to FB, and to abide by those conditions. They aren't going to try to control the spectators.
Friend has an adult son who is performing in the village (was selected to do so, again), for free, no expenses paid, the thing is, he is going to struggle to afford it. Will have to camp with friends, live on white bread & beans, & give up 4 weeks of earnings elsewhere.
It's an elitist event for the elite. What did anyone else expect?