I really like this event.
As far as changes I'd like to see, there are a couple:
1) It would be nice to be able to see what rank our battle decks are. I can see that there's not much free space in that area of the game's interface, so I'd understand if that might not be possible.
2) Something that's *really* needed is to change the behavior of the battle list when no filters are selected. As is, the listing randomly chooses *any* level to put into the list. ...This is bad for new players, since not only are they not equipped to handle high-level players, they aren't going to be familiar enough with the game to know how to specifically search for players their own level. Newbies could end up going through the entire event feeding easy defensive wins to high-level players without realizing it. Please have it changed to default to only show players that are the same rank.
That's about all I can think of right now.