Major League Baseball’s 2020 season has been mothballed for months thanks to covid-19, and even when the truncated schedule begins in late July, it’s doubtful that, for health reasons, there will be any fans in attendance.

There’s no way that filmmaker AJ Schnack could have foreseen this when he started work on his “30 for 30” documentary “Long Gone Summer” a few years ago, but it may have proved