You seem to like ti throw in some events every now and then (and I do like them too, some are not my piece of cake (alliance tower already maxed, not interested in double xp point) but I appreciate the effort and can see how they can be usefull for other players).
I have two other events that I would like to see:
Wave event. Make it for a weekend possible to upgrade more than one wave at a time. Perhaps with cheaper cost or shorter time, but both not necessary in my opinion, just make it possible to upgrade more than one. I would raid non-stop that weekend to upgrade every wave, and probably need to gem a lot to achieve that.
Worker event: make workers cheaper for a limited time only, maybe with faster upgrade times.