Rhapsodies

Assuming Gabriella is crashing the party would be low even for Fedya. Besides she’s interacted with the Band enough, that Shilo wouldn’t need much convincing to put her on the guestlist (considering how Fedya and Gabriella get along he’d think having them both here would be funny)
We haven’t seen Sam, the band’s trombonist, for a long time. He hasn’t gone anywhere, he just tends to blend into the background.
Finally, Gabriella’s shirt says “One way out” in Aurebesh. It’s an Andor reference. Gabriella is a very discerning fan,