Conversation so far:
When was the premiere of the film, Dreamgirls?
Dreamgirls premiered on December 4, 2006.
Where was the premiere of the film, Dreamgirls?
The premiere was at the Ziegfeld Theatre in New York City.
When was the official release of the film, Dreamgirls?
Dreamgirls' national release, at regular prices, began on December 25.
Was the film, Dreamgirls successful when it premiered?
Dreamgirls received a standing ovation at the Ziegfeld Theatre in New York City.
Where were the Dreamgirls roadshow engagements?
Three roadshow engagements began on December 15, 2006 at the Ziegfeld Theatre in New York City, the Cinerama Dome in Los Angeles, and the AMC Metreon 15 in San Francisco.

Question: Were these the only roadshow engagements?
Self-contained rewrite: Were the Ziegfeld Theatre in New York City, the Cinerama Dome in Los Angeles, and the AMC Metreon 15 in San Francisco the only roadshow engagements for the film, Dreamgirls?