guests searchable by region and type
As an anime con, It would be awesome to be able to search other cons near me to see what bands have performed.

So you’d like to be able to select a guest type (such as “Band”) and see a list of cons in a particular region that have had guests of that type?
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Aaron Kelley commented
More like, I'd like to search guest type of "band" by region of event. What I want to get to is a list of guests of type "band" that have performed at an event in a given region. I think this would be very helpful for other convention booking managers such as myself. Nothing like that exists anywere today, and it's a pain in the butt to find good con-gigging bands.