The whole thing is so chaotic now, to some degree I just do what I think is sensible. After insisting that people should keep 2 metres away from each other, even in the open air, it is now being suggested that this be reduced to 1 metre (indoors also), and that you would probably need to be near somebody for 15 minutes before there was a risk of infection. There are so many contradictions.
If people are outside, keep their distance and clean their hands if contact is made with anything or anyone, I think the risk of infection is minimal, especially in small, well spaced groups. Of course, if people feel very anxious about attending something where it might be difficult to keep to the strict rules, they should decline. I'm sure everyone would understand.
The track and trace thing seems to have been a bit of a disaster so it appears there is nothing in place to deal with the virus anyway, other than try to contain the speed at which it is passed on by restricting contact to as few people as practical. I thought the scientists said it would have to work its way through at least 50% of the population before it would go away (though may reappear in the winter). If that is the case and we continue to have no properly organised and effective way of identifying sufferers and their contacts, then I feel more and more risk has to be accepted because we can't go on like this indefinitely.
Of course, older people and people with significant health risks will often take the decision to isolate themselves completely and indefinitely but this makes for a pretty horrible existence and brings with it other health problems.