"German" for a Dance

[Murrah Lee]

A high school friend recently reminded me of high school dances in the
50s and 60s that were called "germans,"  at least in Lufkin, Texas.
It was an all night dance chaperoned by parents that was not
officially sanctioned by the school and not held on school property.
I don't know whether that was a local term or was more widespread.
Does anyone have any information on "german" used to describe a dance?

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