Who is Calvin in guys and dolls?

In the musical "Guys and Dolls," Calvin is not a prominent character; rather, the central figures include gamblers Nathan Detroit and Sky Masterson, as well as their love interests, Adelaide and Sarah Brown. If you're referring to a specific adaptation or a minor character named Calvin, please provide more context, as he is not a major player in the original story. The plot revolves around themes of love, gambling, and redemption set in New York City.