A happy hour was a regular event in bars where drinks were on promotion.

Christine Chapel once claimed to Leonard McCoy she had heard him use the phrase it's happy hour somewhere to justify McCoy drinking early in the morning. McCoy denied he had said such a thing. (TOS - Crucible novel: Provenance of Shadows)

Quark promoted a happy hour in his bar on Deep Space 9. (DS9 episode: "The Reckoning", DS9 novel: Avatar)

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