These things are very personal, and depend on all sorts of things like your general health, your attitude to risk, the venue and so on.
I locked down hard (I have breathing difficulties), but am starting to venture out a bit now. In the past month I've been for lunch with friends twice (2 different friends on 2 separate occasions), have had people round to my house (three friends who are all double-vabbed and careful) and would have been going to a music gig tonight except that the person I was going with has pulled out because of illness.
In each case I weighed up the likely risk (which is, of course, unpredictable), the probability that the venue would have measures in place (easily checked) and balanced the thought of going out against the misery of being stuck indoors indefinitely.
So on balance, if I were you (which I'm not), if the friends are vaccinated and the venue has followed advice about safety, and if I felt utterly fed up with straying in (which I am), I wouldIt has to be y our call in the end, though.