Well, the thought behind it was that we're all double/triple vaccinated and also everyone was meant to take a test before coming to the party, seems clear that people didn't take a test and spread it.
I had my third vaccine on Monday and it is kicking my ass both yesterday and today. Also gonna do my last test at lunch time and make sure I'm in the clear but so far apart from the jab I'm fine so think I missed it.
I work within the events industry, so I think the thinking was, "Well we have been putting on 500+ events since September, why can't we have a party.... even though numbers have been going crazy in last few weeks"