Salvete!
One thing to consider is that it doesn't have to take much to host a one-day or even half-day local Koha event. If you're located in an area where there's at least one other Koha library within reasonable driving distance, all you really need to host an unconference [1] is time, a meeting room, and the desire to promote the event. Everything else, including internet access and even coffee and snacks, is optional.
This can scale up. There are certainly larger geographic areas in North America where there's a high enough concentration of Koha users to support a regional event. And if somebody wants to run such an event... go for it: speak up, say what you want to do, and gather some like-minded people to help.
Once again, my arm can be twisted to host at whatever level. Doesn't even require that much twisting, I just don't want to throw a party and have no one show. :) All I ask is that y'all let me pick dates, or let me in on the voting so that I can express whether they are inconvenient to me or no. #justsayin Cheers, Brooke