September 10 is a very big deal in the history of Atlanta United FC. There’s no doubt that the butterflies will be fluttering in the stomachs of Arthur Blank, Darren Eales, et al that morning as they fix their ties and lace up their shoes before heading out for the day. It’s a day that will signify so much of what the club has built up to this point. On the field, there’s a result at stake. But off the field, whether in the seats adjacent the field or in homes across the state, there’s even more at stake.