Sentence 1: Gerard was performing a show on his birthday. 
 Sentence 3: At the end of the concert, the band left 
 Sentence 4:  Instead of cheering for another song, they sang him happy birthday 
 Sentence 5:  Gerard was very happy and performed an encore 
 Option 1: This concert was the last of the tour. 
 Option 2: He got sick and couldn't perform.