Ghostmon, I don't really know either, maybe at the beginning they only openened the WS for the 2nd week of the events because by then people would have cleared them and got bored?

Anyway, I'm really busy these two weeks with exams so I'll have to wait until next weekend and spend stam potions to clear the event

wbread, I can't post links but if you want the englsh version go to the english flowerknight wikia and search for "promotional abilities"