[the-dude]

Which yearly event was this?

[himlion]

https://en.wikipedia.org/wiki/Elfstedentocht

[the-dude]

This event took place 15 times in the last century. How can this be yearly?

[himlion]

I agree it's hardly a yearly event, but this is definitely the even he is referring to. Theoretically yearly would be a better term.

[the-dude]

Or maybe he meant to say rare event is still rare. Sounds a lot less alarmist too.

The whole comment is hyperbole.