Olivier nominee Diego Rodriguez, seen on Broadway in Sunset Blvd. and in the London Palladium Evita, has joined the cast of the upcoming nine-performance run of September L. Davis: The Apology Tour. The comedy show is set to play Studio Seaview Off-Broadway September 20-October 5. The show will feature SNL alum and Tony-nominated Broadway Schmigadoon! star Ana Gasteyer bringing her campy online alter ego to the stage for the first time, with Kevin Cahoon (Shucked) at the helm.

Rodriguez joins previously reported guest stars Betsy Wolfe (& Juliet), Matthew Wilkas (Ginger Twinsies), Kate Reinders (High School Musical: The Musical: The Series), and Greg Hildreth (Chicago).

Gasteyer created the character of September L. Davis during the build-up to Schmigadoon!’s Broadway opening. The original lore was that Davis, an egotistical and talent-challenged actor, believed that Gasteyer had unfairly stolen the role of Mildred Layton (Gasteyer’s character in Schmigadoon!) from her. Davis even made a surprise appearance on the Schmigadoon! opening night red carpet.

In the weeks since—a period that included Gasteyer getting a 2026 Tony nomination for playing Mildred, the straight-laced villain of Schmigadoon!—Davis has beefed online with a number of Broadway notables, faked her own death, and other hijinks.

The persona is the latest in Gasteyer’s esteemed rolodex of comedy characters, which on Saturday Night Live included such favorites as school music teacher-turned pop music singer Bobbi Mohan-Culp, NPR host Margaret Jo McCullen, Céline Dion, Martha Stewart, and many more.

Press notes share that audiences can expect a night of “apologies, memories, and music,” with the evening themed around Davis apologizing “to those [she] has wronged.” The performance will also include audience participation.

The production will also feature music direction by Nate Patten, choreography by Richard Yoder (Schmigadoon!), lighting design by Nick Solyom, and sound design by Connor Wang. Sydney Price will serve as production stage manager, and Hudson Theatrical Associates is production manager. General management is by Jonathan Whitton.

Gasteyer’s other Broadway credits include playing Elphaba in Wicked, Threepenny Opera, and Once Upon a Mattress.

Tickets are at StudioSeaview.com.