because I Got it through Summer Event 2018 but I can ´t use it in Events because its Rank 2 and Premium
It should be , In my case, an Eventvehicle which would make it able to be used in Events.
Only Vehicles which say Event…. on their stat card. Otherwise they count as Regular or Regular Premium Vehicles.
Because, it was also a pack premium vehicle who have been removed from the Steam and PSN store after the « Good Old Summer » event.
More info on it : T-34E - War Thunder Wiki