The potential drainage of glacial Lake Agassiz triggering the Younger Dryas period ~13,000 ya is another potential such event.

<https://en.wikipedia.org/wiki/Lake_Agassiz>

<https://www.nature.com/articles/nature08954>

<https://www.sciencedirect.com/science/article/abs/pii/S00335...>

<https://en.wikipedia.org/wiki/Younger_Dryas>