Since this didn't involve taking clothes off, I actually took part in this one
I'm suffering now from the after effects of the stupidly early start to the day, but I thoroughly enjoyed the event I attended (at Snipe Dales, Lincs). My bird call recognition is extremely poor so I really appreciated the help from the bird people there
For me the highlights were hearing a grasshopper warbler, seeing whitethroats and watching a kestrel sitting on a tree stump giving its feathers a good seeing to. I'm still not confident at putting a bird name to a call
...perhaps one day!