I think your best bet would be picking a location then searching the web. Keep in mind, they often have them in conjunction with some of the bigger regional races (well... we have a couple like that here). Might want to check with some charities as well (like the Tour de Cure, there are events all over).
I also think USA Cycling has a list of all of the GranFondos you can check out.
Updated: USA Cycling Find an Event



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