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Don't panic Sauren, as long as you finished first on your leader board you have nothing to worry about. A few people that have qualified have also said that the event has disappeared from their game.
If you read some of the posts made in the discussion linked below you will see that you aren't alone in thinking that the event had disappeared
@sauren no one that has come first in the thread that I linked above has posted anything about winning boosters. The only person that has posted about winning boosters is someone that came second.
I guess if the wild card rounds are live in your game then that might indicate that you didn't qualify after all.