How to unlock tavern in middle ages event in eatventure?

You have to level all of the farm areas up to max and then you click the little hammer in the bottom left to renovate it that takes you to the tavern. Once you’ve leveled all the tavern areas up to the requirement and you click the little hammer in the left it will take you to a castle. You then have to level all of the castle items up to 1000 and that is how you beat the mid evil ages special event. Well, this sounds daunting. It is much easier than the moon level. I’m not sure what the various differences are but I can do the medieval ages much quicker than the moon.