I can recall going to the Trocadero in the later 1950s, probably 1956 or 57, for Saturday afternoon dances run by a DJ probably from either CJCA (just down the street from the Troc in the Birks building) or CHED whose offices and studios were on 107 St.
Sometime in the 1950s, I would guess 1955, the Troc sold off its tables. One of them is shown on this web page. My father bought one and converted into a student desk for me to use, as I was entering Grade 7. The table had a shelf underneath. (Why? In those days, liquor was not available at public functions.
Even beer was limited to "beer parlours" with separate ones for men and women. An innovation was the introduction of "Ladies and Escorts". Each municipality set its own rules. St. Albert, for example, allowed men and women to drink together, but Edmonton did not.) My father told me that, at the Troc, the shelf was for "storage" of a "26" or a "mickey". The Troc served soft drinks and, once a table had a round of soft drinks, the bottle would come out of storage to fortify the soft drinks. The shelf was what my father used to build a drawer for the desk.
Mark Sandilands, Lethbridge, Alberta