red wedding

noun2

1. •
   (figurative) A situation involving carnage, bloodshed, or chaos; a massacre; a mass culling.

   • A source familiar with the matter told Quartz that Uber employees are referring to the layoffs as the "marketing red wedding," a reference to a massacre that takes place in Game of Thrones. — 2019
2. •
   (old-fashioned) A wedding ceremony in the Soviet Union in which the couple pledged loyalty to the state or communism in addition to reciting marriage vows.

   • As the church sought to make these events significant with its ceremonies, so did the Communists with their “Red weddings,” “Red funerals” and “Red christenings.” — 1942