So Halo Fest Tickets are sold out? Really? No more tickets? 
This should probably go in the General Discussion forum, but unfortunately yes, I believe all the passes are sold out (and have been for quite a bit now :-/). You might want to check here though where people are able to arrange exchange of PAX passes (face value only) that they might not be able to use. Best of luck, and hope to see you there!
Grim