Dragon egg chart has new EVENT classification..what is it?

[happyheartfla]

The egg chart by Sehana has various categories; Breedable, Arctic, Tournament, etc. What is the one listed as EVENT? I see some of the new Olympus dragons already listed as removed. I don't remember any notes from TL about limited breeding, etc. I'm on Droid, so the only things I can do are breed and feed! I was trying to get all of the Olympus ones.:confused:

[kooky panda]

These events come out randomly, but only offered to IOS players at this time.

http://forums.storm8.com/showthread.php?71099-World-Event-(IOS)-Dragons-of-Olympus