I have found some references to another downtown Las Vegas restaurant and gaming establishment and can't find any collectibles or much more information on it. So I'm reaching out to see if anyone might be able to help.

Circus Room at 523 Fremont
(Fremont @ 6th) (from June 5th, 1954 FLV article)
Owners G. L. Gordon and Mrs. Melba
The article about their grand opening says they are promising "gobs of jackpots" so I'm assuming from that that there were at least slot machines.

It is listed in Fullers Index 1954 to 1962, but no owners names or gaming types.

It is not listed in the ChipGuide or Chip Rack-14. Just one in Lake Tahoe by the same name.

Well, they used to have this restaurant, this little hot dog place downtown called Circus Room, Circus Room hot dog. If you never had a Circus Room hot dog, you ain't never ate a hot dog, okay? This big guy used to cook these hot dogs. Ooh, they were off the chain good. Oh, my gosh, they were good. After I left EOB [Economic Opportunity Board] I went to work for Centel Telephone. They were downtown. Circus Room was around the corner from there. I ate at Circus Room every day. The hamburgers were good, but the hot dog was very good. That's what I remember. And Chic Hecht had a store across the street, a clothing store for women across the street. All this was on Fremont Street, off that street.

(from: Interview with Estralita C. Williams, An Oral History Conducted by B. Leon Green UNLV Digital Collections) http://digital.library.unlv.edu:81/u?/ohr,641

"Bill and Mary McCade were the owners of a hot dog place on Fremont Street called the Circus Room. They came to Vegas from Chicago in the late 40's early 50’s…...