 This allows teams a few extra days to prepare for the first week of the regular season.It also prevents conflict with the start of the regular seasons for high school and college football, allowing those venues to expand their first weekends' games from Thursday through Monday (Labor Day).There is usually a conflict with the Major League Baseball season, a situation seen in the 2015 preseason when the Pittsburgh Steelers moved a Sunday evening game against the Green Bay Packers at Heinz Field to a traditional 1 p.m. kickoff to avoid parking conflicts with the Pittsburgh Pirates across their shared lot at PNC Park, when the Pirates had a game moved to Sunday evening as part of ESPN's "Sunday Night Baseball".