Large events in the UK require participants to (1) run nonfree
software to get a ticket and (2) identify themselves.
There is no justification for requiring nonfree software — they could
do the job with free software. Rather than run the nonfree software,
I would choose not to go. It isn't the end of the world to stay away.
Identification is a more complex issue. I can't argue with the
importance of contact tracing for beating Covid-19, if the country
makes a serious attempt to do that. Some countries try to do that
carefully, but I don't think the Tories have tried. They give the
contracts to incompetent companies for political reasons.
For the same reason, I feel safer staying away from those events.
I wouldn't even think of going if I were not fully vaccinated.
But even vaccinated people have a small but significant chance
of catching the Delta variant.