GaKaye said: But why not? It's really just an excuse to party!
Apparently, ... as I have found no link to altruism by either location hosting the Dive.
In the Netherlands, as in the U.S. with the Polar Plunge, there is a charitable or fundraising aspect...not merely drunken debauchery and a way to promote the establishment.
"It is good to do nothing all day, and then to rest"