This weekend is the Invasion of the World Bosses! It will start on the 23rd and run through the 25th, server time. It's a good time to die a lot, take a whirlwind tour of the back alleys in a bunch of zones, and loot some goodies from the reward chests. It can be pretty rough for newbies in the higher level zones but not impossible with the larger groups (and it's something to work towards as you level!)