For the first game celebration we can have too many great rewards.
Some of them:
1. Exclusive Skins and Paints: Rare and limited-edition items which are available only for players who will attend the first celebration.
2. Special mode and map which will be introduced during the event,
3. Discounts up to 50% on items, upgrades, and in-game currency (crystals if the payment is already been worked).
4. New unique missions where the rewards will be only available during this time.
5. Fireworks and Visuals: The game can have enhanced in-game visuals and fireworks to reflect the festive atmosphere.
6. And the most enjoyable thing: GoldBoxes - with a chance of x4 gold rate