I was attempting to recall what exciting moments we had in previous "pre-expansion" events. I started playing WoW shortly after The Burning Crusade had gone live, so obviously missed that one, but the only one since then I recall that I found interesting, and a whole lot of fun, was the Scourge event that preceded Wrath of the Lich King.
I know a lot of people hated this event, but it was definitely different, and memorable.
So, here is a quick list of expansion events that I have been able to dig up:
The Burning Crusade
Wrath of the Lich King
Cataclysm
Mists of Pandaria
Warlords of Draenor so far has been pretty 'meh', event wise anyways. But it's only been a day.
edit: changed all links to Wowhead for consistency. Well, except for TBC..can't find one.
Edited, Oct 15th 2014 7:38pm by Xizervexius
Edited, Oct 15th 2014 7:39pm by Xizervexius