Don, that's a great Harrah's Venice matchcover.
I've heard of the "Circle Game" -- I think it was mentioned in the "All the Lights Were On" book / oral history.
Never heard of "The Plaza" or "The Vogue".

Any idea what these were? Additional stalls with different games, or perhaps arcade games like old pinball, skeeball, etc?
Venice is still a colorful place, after all these years!!