According to the Mar. 4 news post, the event ended on MARCH 18TH 11:59PM.
That's when we stopped being able to gather currency.
So today really is "a few days after" -- sucks that it wasn't clear for you, though.
Maybe the Winter Tree being open till now confused things?
Not sure how else they could've made it more clear, it was right there in the News Post. Even the Winter Tree said "the event is over" for a few days now.