There are lots of great conventions in the works for 2008, not just in the magic field, but also the related arts of juggling, unicycling, clowning, and ventriloquism. You'll find most of them listed in the world-wide Convention Calendar on my site, and if you know of any that I have missed, just e-mail me to get it included.
This Calendar is also tied to my Calendar of Magic Lectures, since many lecturers also appear at conventions. But to find a great lecture near you that is NOT connected to a convention, you can use the same Calendar. Again, if you know of a local lecture that is not listed there, e-mail me to get it added to the list.