Alex was there but she didn't sing, just watched people and was amused and entertained.
Claire was probably there but didn't sing either, just laughed her ass off at the more...colorful performers.
Kara was there, and would have tried to drag her sister Alex with her. She definitely participated and one of the songs she sang was Somewhere Over the Rainbow in this styling.
Veronica was there with Steve McGarrett. She sang Blondie.
Feel free to say your characters interacted with any of mine that were there.