I had previously written a post Saturday Night Dancing in 1950s London, and Rick was intent to correct some details. Dance classes were never on a Saturday evening; instead they were on a Saturday afternoon. During a dance class you would have men lined up on one side, and women lined up on another. They would have arrived separately and be asked to pair up in order to practice the dance. It is during a dance class that Rick and Joan were paired up to dance and subsequently started dating, grew to love each other, and got engaged on a rainy day while sheltering in a phone booth.