I found a pretty much awesome spot to level from around level 35 to 55ish(the mobs are around 42-45 level here). Events go almost non-stop here and the exp you get is insane. If you're lower level stick to the cannons to get enough contribution in the events.
Its in the Blazeridge Steppes, Steeleye waypoint.
Pictures to find the spot easier
Here is a video of Hoax doing the full circle ( www.ownedcore.com/forums/members/23551-hoax.html )
http://www.youtube.com/watch?v=Nzujil3zuuI
Also added a more detailed picture with other nearby events which occur in this zone marked on it(ty again Hoax):