When “American Idol” and “RuPaul’s Drag Race” alum Adore Delano and “The Voice” contestant Sasha Allen talk about coming to San Francisco for annual musical and comedy Holiday Gaiety (Sat/17; Davies Symphony Hall)—hosted by Peaches Christ and conductor Edwin Outwater—the excitement is real.

It comes out naturally, in overlapping sentences and easy laughter, the kind of energy that suggests they’re still slightly surprised by how much they enjoy doing things together—onstage and off.

What emerges is something loose and genuine: two artists acutely aware that they’re stepping into a rare experience, and doing so side by side.

“I’m excited,” says Allen, plainly.

“Sasha loves the holidays, so I do, too,” adds Delano.

There’s a tenderness in that exchange that sets the tone for everything

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