We will be replacing the Mabar Festival of Endless Night with a new event, currently scheduled to debut sometime after the release of Update 24 (not this next update; the one after it.) The new event is likely to make its debut after the new year. We're not yet ready to provide details about the event, other than the hint provided in the Producer's Letter from July, but we can say that the event's items will be the items from Mabar. At this time we have not been able to recover the Mabar festival in a way that addresses the issues with it and allow for its return.

Regarding Crystal Cove, we're planning to run the event this year with the new tier of loot around the time that Mabar would normally arrive. The plan for the future is to have the new event run around the time that we used to run Mabar.

https://www.ddo.com/forums/showthread.php/446997-A-hopeful-request-Turbine-Mabar-2014?p=5427269&viewfull=1#post5427269