I've dropped by to mention a great con set in my home city of Ottawa, Canada: Can*Con: The Conference on Canadian Content in Speculative Arts and Literature.
I've been going for three years now, and every year it just gets better. If you're a reader and at all local, it's a brilliant way to get involved with the the wonderful intersection of Canada, Spec-Fic/Sci-Fi, and Reading/Writing worlds. It's got brilliant panels and workshops for authors as well as readers, and has a heavy science component that I've never seen matched. Any writer will find something for them (it's by no means SF only on that front). The panel list is just about being finalized for this year, but you can check out last year's panels at the can-con.org website.
Bonus? The ticket price doesn't break the bank.
Before I forget, though, the Guests of Honour this year? The Writer Guest of Honour is author Steven Eriksen; the Agent Guest of Honour is Kim-Mei Kirtland; and the Editor Guest of Honour is Shiela Gilbert.
If you're at all curious, I really do suggest you check out can-con.org for details. It's an awesome event. I went as a reader, and I've been since as an author, and the experience was awesome both ways.