Let the market decide. There are conferences and trade shows for everything and anything all the time, all over the world. Take your favourite programming thing, there may be some meet up in your local town, it may be just a couple of people, not exactly a 'conference'. You might not be able to go to the big conference in Las Vegas (or wherever) but the conference in Berlin (or wherever) might be the one to attend this year anyway.

There is money in conferences and, if the USA wants to make itself as attractive as North Korea for foreign visitors, then the 'second tier' conferences held elsewhere will become the more important events to attend for non-Americans.

I think this is progress in a way, too many industries have some big U.S. trade show event as the focal point of the year and it is a long way to go to get new customers from your own country/town.