be up on

Soon, Snoop Dogg and Dr. Dre, the Red Hot Chili Peppers and Billie Eilish would be up on the makeshift stage — set beside fake palm trees short enough to be caught in frame — doing their thing in front of a small but adoring crowd of extras.

“On the other hand,” I observed, “Beatrice may be up on the open deck with Mouse Equerry Lord Peter this very minute. A rendezvous. They may be whispering sweet nothings into each other’s ears, and planning a future.”

All the humans seemed to be up on deck, watching us sail.

Would he like to be up on stage with his fellow right wingers?

So I do see the benefit of them, and I ain't going to say, "I don't want to be up on that stage."