I checked quickly and tickets aren't on sale yet. I don't imagine a lot of people will go, maybe 8,000?
Last year, "Futures at Fenway" drew 16,125 on 8/8. It featured the AA and AAA Red Sox teams. Plenty of last minute seats available. My guess is that if someone always wanted to see a game at Fenway, this would be the easiest ticket to get to see professionals.
