I was at one a few weeks back (nary a mask anywhere) and was again reminded of the importance of being organised.
With so much going on, you really need to know beforehand how best to use your time.
For the first hour or so, I was having trouble distinguishing large sonic differences between the various rooms.
Nothing initially seemed to stand out in an easily identifiable bad way this year and that certainly has not been my experience previously at shows!
I can’t also remember seeing so many folks using their phones as cameras this year. It can seem a little obtrusive but if done with some discretion it will help with preserving memories afterwards.
It’s also best not to be too shy or reticent. Often the designers are there in person and most will appreciate a few choice questions.
Most will also accommodate requests for tracks. Allan Hendry of Monopulse even handed out a couple of sheets with his favourite 100 tracks to select from!
The main problem is just how fast time flies when you’re having such fun!
Here’s a detailed write up by Ian Ringstead in HiFi Pig
https://hifipig.com/uk-audio-show-2021-show-report/#more-141151