If you say that something such as an event or a film is unmissable, you are emphasizing that it is so good that everyone should try to go to it or see it.
[British, informal, emphasis]
His new show is unmissable.
Book your place on this unmissable conference.
unmissable in British English
(ʌnˈmɪsəbəl)
adjective
(of a film, television programme, etc) so good that it should not be missed
Examples of 'unmissable' in a sentence
unmissable
It really was an absolute unmissable bargain & will look marvellous.
Bénédicte Newland and Pascale Smets AND GOD CREATED THE AU PAIR (2005)