Best of luck...I’ll need more than a date before I sit next to someone indoors apart from my other half, or are you calling it a ‘2 jabs meet’
I think most attendees will be double-jabbed by then, but it's not a pre-requisite.
Right now, daily infection rate is around 2,000, so assuming only say a 1/3 are spotted let's say 6,000 per day in reality. With a population of 60 million that's about 1 in 10,000 people. The number of people I intend to sit indoors with in the 3 days is quite a small number - well below 10,000. The risk is low, and lowered further still by the jab(s).
And weather permitting, we'll be sat outdoors.
Oh, it's Wales, so make that indoors then.