Halloween event is out. Runs for a total of 21 days. Seems like a lot of grinding, but the event area itself is zero oil cost. Event area, like PoC, does not count toward map battles. Two paths on event area, one for each 5* event tank's specific currency (2 bat wings per bat wing path map for M3 Satan (L). 2 ghosts per ghost path map for Panzerwerfer (A), each worth 300 points out of 225,000 required for each tank's path, so 750 of each will be required to max out both, 475 of each if you just want one copy of each of the event tanks). Generic currency (jack-o-lanterns, 1 point each) usable for both is available on the main map, but hardly a drop in the bucket for the event.

Each 'path' has intermediate goals along the way. The 3,000 point goal is 3K oil, 100 cores, 10 candies, and a 4-5* tank (Churchill Crocodile for me, a new one). 60,000 point goal is 10K currency, 100 cores, 2 spin tickets, and a 5* emblem. 142,500 point goal is 100 cores, 5 tickets, a 4-5* emblem, and one copy of the path's tank. The full 225,000 point goal is 100 candies, 2,000 blueprints, and two copies of the path's tank.

I received an entire daily mission's worth of medallions from running some event tiles, and also received 1-3* tanks from others. You can reset the event area for 150 cores...presumably that's for 'resetting early' and I hope will not be required every day.

Also, our request for additional platoon slots has been answered. Cost is 300 cores for each, max of five platoons. New platoons count as extra tank storage.