The April fools WW1 was very lovely event, recreating historical events such it by simulating it in war thunder was a very nice touch.
Being able to play with WW1 Vehicles and test how it feels to be part of such events was incredibly Entertaining and amusing.
I Suggest of bringing it back as both in a tech tree researchable and premiums special vehicles in Ground\Air\Naval, and as a special new Gamemode alongside the Nuclear thunder gamemode that will come After sometime.