Shvartse hasene: Plague weddings

Question

I just learned of the custom of shvartse khasene, or 'black weddings', conducted in certain Russian and Polish Jewish communities during times of plague.

A bride and groom, both orphans, would be married in a cemetery, under a black canopy, with the intent that the ceremony would draw the attention of God and the plague would be lifted.

Black weddings were held during cholera epidemics, during the 1918 flu epidemic, and most recently, in Israel, just this spring!!

https://www.nytimes.com/2020/06/13/nyregion/spanish-flu-coronavirus-black-wedding.html

Answer 1

There were probably many other superstition rituals that developed in time of plague.  Any one know of others?