Just a quick bump for the Complete Guide.
Note that if you haven't gotten a hotel room by this point, your options will be very limited anywhere close to the convention hotel. Many hotels are sold out; there is always the option of waiting for someone to cancel their room, but that doesn't always pan out.
Also, if you need transportation to the convention, there is a Guide to Public Transportation in the Complete Guide, including maps of routes, links to schedules, and fares. DART is far cheaper than parking for the weekend, believe me.