I would communicate with the local agent and whoever is organizing the Shadowrun for that convention and confirm what will be available there. If they are going to run exclusively Neo-Tokyo, that will shape what you might want to do.
SSDR is right, there are a total of 14 missions available to characters made for Neo-Tokyo (6 SRMs, and 8 CMPs). CMP missions are rarely made available to the public (only the occasional compilation book) and SRMs usually take several months if not more than a year to be released in PDF. To give you an idea, not all of the Chicago Missions are even publicly released yet, I believe they've only put out 2 of 6 of the final season.