When we saw Elton John, at one point near the end of the concert the security guards all came up and forced people away from the stage and circled it. We didn't know if he had gotten a threat or what, but it was obvious something was going on. Then, nothing happened, and the concert was over.

Afterwards, we asked one of the guards why they had done that. They said that Billy Joel had shown up backstage and they didn't know if he was going to come out and sing with Sir Elton. Alas, he didn't.