After 10 years of BlizzCon—and 10 years of contests—we’re taking a fresh look at our approach to BlizzCon contests. We’re considering some new approaches to how we handle things, and are taking another look at our contests’ structure and format at the show. Ultimately, our goal is to celebrate and showcase you guys the best way possible.

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Thanks !
I didn't find the right solution from the internet.
References:
-https://us.battle.net/forums/en/blizzcon/topic/20754966157
-Marketing campaign examples