Originally Posted by Shadoefrost

Just started 2 days ago and i am a newbie, could someone please explain exactly what i am meant to do this event and how to get event char(just been farming coins so far from daily)

Most of the info you need is in the first post of this thread, (click open spoiler to see the images). As it says there, gather medals by clearing or completing stages (max three medals per stage).
The event girl will be handed out when the event ends. Again, that info is there in the first post.