this info is not particularly new but is still active (and is in my standards still doable).
In EU, until Tuesday 30 June at 07:00 CEST (UTC +2), to celebrate Tankfest in Bovington, WG has prepared a special mission where you can earn a 7 days rental of the TOG II and a garage slot,
- Tier IV and above only;
- Random Battles only;
- Once per account.
- Earn a total of 25,000 XP over any number of battles;
- Be in the top 10 players on your team by base experience earned (bonuses for the first victory, premium account, etc., will not be counted to determine the rankings).
They also have 3 not so rare tanks being sold: