The first year I played World of Warcraft was the year they released Wrath of the Lich King, and the world event for Hallow's End that year was marked by rolling hordes of zombies in all the cities, and mayhem that kept us lows (players who didn't have characters at max level. Level 70 at that time) from getting anything done. A world event and a expansion pack release event rolled together, or so it felt at the time.
|"What are those weird glowing crates for?"|
Oh, well. There is always next year.