I'm a massive hypocrite - I think the rates of infections reported from other festivals in recent weeks are, on the one hand, higher than we should probably be allowing from a national perspective; but on the other hand within the risk limits I personally am willing to take, at least as a one-off, given the importance of End of the Road to me, this year especially. (I'm not actually worried about getting covid myself - what will be will be - only about spreading it, and I plan to be supercautious, if not completely isolate, for a week or so once I'm back.)
Also, as others have said, the risk isn't necessarily random, some of it may be coming from crunch points such as the travel, and even when there there may be useful mitigation measures that can be taken. I'm not sure I can make a blanket rule of staying out of the indoor tents altogether - the Tipi in particular would be difficult - but I'll see how things look and feel when I get there. Sure a great festival could still be had at the outdoor stages only if it comes to it.