I love the name fairy floss - I think it is much nicer than cotton candy!
And I love the celebration of Spring - it is my favorite season after all: the rebirth of plants, the warming of the weather, and of course more outdoor festivals. While I don't typically find myself going to city celebrations of spring like you have in Finland, it does mean that outdoor music festivals start to pop up on our calendars.
In fact, that was part of the reason why we came to Spain, and Ibiza in particular, for this holiday - we went to the opening party at the #1 club in the world - Hi Ibiza. Then in two weeks it is off to Las Vegas for the biggest Electronic Dance Music festival in the US - the Electric Daisy Carnival. Now all I have to do is work up the courage to propose to my partner during a spring festival like you did. Easier said than done!