That's not an overstatement. As I said, these are only the main ones. There are many others.
你这样说一点也不夸张,我只是说了几个重要的节日,还有很多没有提及呢。
People who live in Britain needn't despair when they made mistakes like this (and a lot of people do)!
当英国人犯这种错误时,他们不必感到绝望(而许多国家的人都有这种绝望的感觉)。