Foamer Night?

In the mid-1970s, the Astros brass devised a promotion called Foamer Night that took advantage of the massive scoreboard that Judge Roy Hofheinz installed in the Astrodome.

On Foamer Nights, “a special light on the scoreboard lit up at a particular point of the game, and if an Astros batter hit a home run while the light was on, fans received free beer until the end of that inning.”* Home runs were so hard to come by then that the home run requirement was changed to a strike out, and Houston Astros pitchers like Larry Dierker sent fans scurrying to the concession stands with a well-timed K.

*quotation from Rain or Shine: How Houston Developed Space City Baseball by Mike Acosta

On a somewhat related note, in the Astrodome’s early days there was an Austrian beer garden, behind center field, known as the Domeskeller.