There are two more issues with this event.
1) The duration of the event was reduced, but no measures have been taken to adapt the event to the reduced duration. As a result, we are now stuck with an event that cannot be completed, not even if players were stupid enough to invest lots of gold in trying.
2) Again, the rewards do not follow the usual formula "base value x games speed x personal game progress" - the rewards do not take the personal game progress into account. We had reported that as a bug in 2018 and received the answer that in this case this behaviour was intended but that our complaints (rewards too weak for an event that time consuming) would be considered for future iterations.
As a matter of fact, none of the feedback from 2018 has resulted in any improvements - absolutely nothing has been changed or adapted or fixed.