But see how 21,000 fans can fill manchester arena. the biggest events hold more than this. more than 73,000 in the principality stadium in cardiff, 90,000 at wembley. and see how 100,000 people turned out for this climate change strike during cop 26. and this crowd aren't even all of the 135,000 people who buy tickets for glastonbury every year. but 150,000 people, that's everyone who lives in a city such as oxford. other covid waves came and went. in march, july and october but that was the last time restrictions on socialising were put in place. and crucially, while the number of people admi...