The Event seems to be well balanced and very polished.
I like the accessible new building and that every event feature has its own building that is "seperate" so they are not independent on another.
There is the main building + new daily specials - basic event
The Atzec thing - calendar
The treasure hunt - catographer
eventpass - villa upgrade
Im actually fine with this eventpass because it is nicely balanced, you get lots of stuff which i think is good for the average gamer/customer - i also think it is a good idea to put the golden kit at the very beginning and not like in other events behind another diamond paywall (st patrick was really bad where you had to buy your way to the last avatar).
The new buildings seem all very well balanced, they are a clear improvement but not overpowered. But I think you there are too many of new items. 3 New Boosts, 3 New 1x1 Building, New Villa, 2 Eventbuildings, Calendar-Reward, Carthographer. I think you went a bit over board with that especially if the next event then only has like 2-3 new buildings, but i still like the effort.
What I dont like is that we lost another of the original events and its unique mechanic, but I appreciate that there are less fields on the board (2 less than winter event) so to finish a board will be cheaper/quicker and with the same amount of dubloons you will probably be able to play more boards, than you could play in the winter event.
Does somebody know how many fragments are needed per black boost.