US is just huge. I understand what you mean, it is a complex and expensive plan. But I don't think it's impossible that one of these events will take place there, I think summer is recurrent because there are more people with available dates.
Well, it all comes from sowing the first seed, you create a meetup in your city with enough time for some people to consider it and it might end up being easier than you think! The thing is to give it a try.
I've thought about getting together with some of the people in Michigan, but I am not sure how many people would actually show up. This time of year with the beginning of the school year is never going to work for me.