They are not limited time offers. They're freaking Events. Events in MMORPGs have always been either Seasonal or One-of-a-Kind. Be they Subcription based (though, particularly Sub-based have been this way) or Free to Play.

You either do the event or you wait and hope they run the event again, or in the case of seasonal events you wait until the next time they occur. Deal with it.

Everybody want's a handout. -_-;