Austin GDC
Anyone can vote here: http://www.austingdc.net/vote/
The registration process is painless and near-effortless. To read the god-awful pitch for my abstract (rather than the abstract itself), just run a search in the entries for "Alexander". If you want to do things the hard way/get a better look at the competition, you can scroll through the long list of rival entries and look for "Alexander the Great: Narrative Approaches to Ludic Historiography and Simulation."
If you've got a lot of school spirit, you may be pleased to note that IMD alumnus Stephen Dinehart also has a lecture in the running, "The Importance of Story."
But why should you vote to send a talk about Alexander the Great to the Austin GDC?