I received reward for being one of winners- but no charm packs either and I took part in both of these.

Daiske said then on discord that "rewards will be send on Friday" and I guess winners got them but mod on fanfic section mentioned FEW WEEKS as waiting period for rewards for this event, so I think for charm packs we have to wait longer, because so many people did entries and they have a lot of work with it?

UPDATE: I just logged into game and check mail- and there's reward for participation now!