With anniversary event coming soon, I think it would be a good idea to make a 4 week event focused on OG World of Tanks, before 6.0 update (July 21th, 2020). Anniversary isn't going to be a big event like in 10 years (I think), making it possible to make it.
Below, I will describe how I would like the event happens
1st week:
-A way of getting Xbox achievements related to War Stories and Minigame gets added, making it possible to get all WoT achievements
-Free T22 Proto for everyone who played and sold it BEFORE 6.0 update
-Portuguese language on menu comes back!!
2nd week:
-An event storefront opens. You can now get various items and tanks, including the new ST-62 Version 2 soviet tier X medium tank, SZDV Vz. 50 Czech tier 8 TD and Black Prince II British tier 7 heavy tank (could happen on 1st week too)
-NEW!! Special "Travel to the old times" gamemode, resembling old WoT
3rd week:
-Community event to earn free old tanks, cosmetics and war chests, related to the 2 special modes
-"Hunt to the E 100" Coop event, inspired by the original single player gamemode of the same name
4th week:
-Hunt to the E 100 ends
-Last chance: tanks available to purchase with gold
Post event changes:
-Portuguese language on menu stays permanently