I played in another free to play game before that had its fair share of botched updates and events. But, the developer of that game would give compensation items for such occurrences and it was a nice token gesture. Its a way of saying they understand our frustration and want to do something for any lost time and inconvenience.
I think a 5x uber pack awarded to all players would send that message. It would be preferable if it could be sent instantly to all players in the game. But if technical issues prohibit this, then adding an additional 5 uber chests to the log in calendar would suffice.
The reasons why I think the players deserve this:
Many players have dropped trophies to be competitive in an event that isn’t happening. Others worked hard to increase their trophies to get to the next tier.
Due to the previous defense boost event, the amount of gold out there has been dismal. The lack of having another event will perpetuate this situation.
The uber chests compensation would help to make up for lack of gold or offer pearls from melting. I think such a gesture would go a long way to helping to forget the event didn’t go as well as planned.
The following was added in an edit.
The above suggested compensation was only meant to address the issues at the beginning of the event that forced it to be delayed.
In light of crashing issues and the amount of gems that has now been spent, other additional compensation should be considered. Some other threads make excellent points regarding where to go from here.