Caty Steward doesn’t want to give too much away about the “Roles I’ll Never Play Cabaret” because it’ll spoil the surprise.

She does reveal that the title pretty much describes the show and that she’s stepping out of her role as Theatre Baton Rouge’s marketing and directing coordinator to direct it.

The show will be the night’s entertainment for the inaugural Theatre Baton Rouge Summer Auction Gala on Saturday.

“We have 75 auction items donated by businesses throughout Baton Rouge, and we’ll also have some great food,” Steward says.

But the main spotlight will be on 31 Theatre Baton Rouge veteran actors performing some 20 musical numbers on the Main Stage against the backdrop of the summer musical set of “Disney’s The Little Mermaid.”

Each of the actors will be performing numbers opposite of the roles in which they’re usually cast, which gives the show its name.

“It’s something I’ve always wanted to do,” Steward says. “I’ve always wanted to do a show where you might have an older gentleman singing ‘Tomorrow’ from ‘Annie,’ or a child singing an adult’s part.”

Or an actor who usually would sing the part of a prince suddenly stepping on stage as the princess.

“These are parts that none of these actors would sing, but now they have their chance,” Steward says. “It’s going to be great and funny, and it’s going to be fun.”

Steward started compiling a list of actors and songs earlier in the year and chose a cabaret setting to simplify the production.

“It’s my hope that we can develop this into a series,” she says. “You can do a lot with cabarets. They’re smaller, but you still have the feel of a musical, and you can do more of them. I can’t wait to see what we do with this.”

Terry Byars will accompany on the piano for the numbers, and Kurt Hauschild will be the master of ceremonies.

“Our costumes will be minimal because we want the focus to be on the music and the performers,” Steward says. “They’re the important part of this show.”

Follow Robin Miller on Twitter, @rmillerbr.