Out here in Canada, I don't think I have ever seen a live boxing event in a bar, except Mayweather-McGregor and Fury/Wilder (had to go to a British pub in Vancouver for the latter) Is the situation in the states similar? Do you think boxing is missing out by not having more live events shown in bars, particularly in North America? Pretty much every major UFC event is shown in bars.
Nope. Lots of bars in America (the state of MA, at least) carry fights. Usually Hooters will carry boxing and UFC and Buffalo Wild Wings only does UFC.