"Labor Day. That's sometime in November, isn't it?"
Picnic, co-starring Rosalind Russell, was an Oscar nominee for Best Picture of 1955. Like Auntie Mame, it was a project that originated on the Broadway stage. Roz didn't star in the Broadway play. She replaced Eileen Heckart as the middle-aged, high school teacher who's afraid she'll live the rest of her life as an old maid, an unmarried woman. In 1950s movies, you were an old maid if you were 29 and a single woman without a steady boyfriend. Rosemary digs a good stiff drink once a while. Well, more than once in a while. You'll see at the Labor Day picnic.
Why does the instrumental make no sense? The town is at this Kansas picnic.