What happened: Fans raised concerns about obstructed sightlines, small scoreboards, long staircases and concession shortages during the first football event at the Buffalo Bills' new stadium. The Blue and Red scrimmage provided the venue's first large-scale test with spectators.

Why it matters: The complaints put early pressure on stadium operators to address accessibility, concessions and crowd flow. Buffalo has several weeks to make adjustments before the building stages its first regular-season game.

What to watch: Watch for operational changes before the Bills' Sept. 17 home opener.