User blog comment:Shinhwalee/Major Event Preparation Guide for Admirals (OUTDATED)/@comment-202.67.42.39-20150421082703/@comment-26171095-20150421093525

If you have a level 50 Yamato and are planning to sortie her for the majority of the maps (despite her absurd consumption and your lack of fuel), then you should get her up to kai before the event. 3-2-A is your best bet because it's extremely safe and is resource-efficient.

The reason you would kai her before the event is so you can modernize her fully and also so you won't have an unexpected windfall in resource consumption for her remodeling cost.