Several countries have, or are about to, demand Covid-19 passports to gain entry into large venues. Sadly it would appear that previous vaccines do not stop the Omicron variant from being spread. So, after a large event Omicron could still be passed on.
It would appear the real motivation is to get more jabs in arms, especially boosters that appear to work.
So far, evidence from South Africa suggests this is easily transmitted between people, but far less severe. If this proves to be the case, Covid could spread widely, but herd immunity might kick in sooner, which would be good.