I've been stuck on the fifth mission for several days now. I can collect as many as 6 or 7 items in a game, and they are all paper laterns, which no longer do me any good. I get one of the two items I am missing every 50 or 60 items or so, regardless of who I use, and since I average about 3 per game, it is unlikely that I will finish the level before the event ends.