Saw Santo's Circus setting up near Rye last week and thought that was brave. These are just small business' trying to earn a living in terrible times. However I bet football clubs have gone to far, far greater lengths to prove to the authorities that they have the protocols and can safely manage crowds in and out of their stadia.
Perhaps more shocking is this . https://www.bbc.co.uk/news/newsbeat-54617387
If Thorpe park and similar are allowed 50% capacity I see no reason why it is safer than a season ticket holder only attendance at football matches up to the same percentage.