Fui hoje a um musical do qual faz parte meu ator favorito. É o musical imperdível deste ano.

English Translation

I went to a musical with my favorite actor today. He’s the one must-see for this year.

The English translation here is not correct. In English the pronoun he is not used for a thing, in this case the musical. Secondly, the word order is in second sentence is not good. If should read: It’s this year’s unmissable musical. or It is this the unmissable musical of the year.