Any show on a Thursday will be a crap shoot. A lot of people, games and venders don't show up till Friday because of work issues.
The best answer I can offer is to check out the Ann Arbor pinball show. It has a different show model, one that should fit well into your level of expectations. But it starts Friday may 16, not on a Thursday. If you're married to the thursday model, i cant really offer much. http://vfwpinball.com