@stuart It might just be regional start with smaller groups in the beginning similar to Old School too. These events did not start out at 80+ they grew and they grew fast.
Most people want to play the cards that they own with like minded people. I think if I could convince the local shop owner I know to do a yearly event and I think she would do it then we could draw 30 - 40 in the first year or two and grow it out from there.
Regionally, I know my area has Battle Creek, Cleveland, Toronto and Detroit. I think if a few others like your region does the same we could growth it out similar to Old School.
The people who want EV can play in a GP for all I care.