On the Fools Day in 2015 there was cool event in WT:
In Enlisted we already had si-fi and modern warfare, why not have dieselpunk?
Possible event name: “Unknown war 2: Diesel warfare”
Special rules: respawn points system - to pick walker, you need to spend 500 respawn points (equal to score). But walkers can capture points and unlimited per team.
Maps: city/village maps. I think perfect choice is Stalingrad
Mode: conquest
Armament: ww2 guns in dieselpunk style - overcomplicated look with muzzlebrakes, cooling tubes, switches, holes and engraved metal parts.

USSR: Mosin 91/30, SVT, PPSh
USA: Lee-Enfield No.4, M1, Drum Thompson
vs
Germany: Kar98k, Gewehr 43, StG
Japan: Arisaka 99, Type 4 SA, Type 100 SMG
Grenades are impact only.
Vehicles.
As been said, this are walkers:

For event purposes, I suggest increase movement and turret speeds 2x times.
USSR: Green camo, red stars with gold outline on top and sides
USA: Yellow and blue camo with white stars in blue circle on top and sides
Germany: Gray camo with black crosses on top and sides
Japan: White camo with red circles on top and sides
Rewards: idk, maybe country-specific SA with engraved “Victory” on top or another cool skin