Definitely some kind of big event, which would be like a Birthday event. Maybe named like 1stCyber Birthday or CyberTankz Birthday (If anybody has better names then write them and if people will like it, then accept such name of birthday celebrations)
Special event, maybe like Kill the King/Godmode_ON (One of the administrators/developers will use combo like Juggernaut + Terminator, while participants have to try to kill him. Juggernaut could have like 100% protection module or special paint that guarantees such big protection. Player that kills such "King" or "Godmode_ON" (depends what name will be accepted) will get 5k crystals and 3 days of Premium (Prizes can be discussed). Of course it could be a separate, small event like Box Collector or Mine Hunt, but I think much bigger event for such occasion, with more players and bigger prizes would be a very cool and great idea.
70% or 50% discounts. Maybe not everybody will have some many crystals bought or gained from invitation contest on Discord server, that's why I think maybe like week-long discounts to be added.
Special festive Gold Box skins, their drop zones, cargo drones (those that holds dropping supplie boxes), billboards and other festive decorations.
Tripled funds during weekends or during the time of the event which will be a celebration of the game release. Oh! I'd almost forgot. What about the duration of such event? Maybe 2 weeks would be good. Feel free to discuss those points.If you have objections or don't like something, write your own ideas and we'll see what the reaction of other players will be.