Back at Asian Fest several weeks back, I actually was able to contribute a bunch of VOCALOID songs, as well as some Karaoke tracks from some other animes, like Bakemonogatari, Bungaku Shoujo, and a few others I can't remember off the top of my head and whatnot. I plan to be contributing a lot more before the con begins, so I can assure you guys that by con, there WILL be a lot of VOCALOID and probably selections from other animes as well. :]
Also, the books on what karaoke tracks we have at Open Mic Karaoke haven't been updated in a while (from what I'm told by someone else), so there is a chance that the karaoke track you're looking for might be available. If you don't find it in the karaoke book, try asking the people behind the table to see for sure if we have it. :] I know that I include lyrics with every song I contribute, so there is also a chance that we have lyrics as well.