I wonder what will happen across USports. If there were mid-season games it was a long time ago.
The AUS no longer allows for Exhibition games during the playing seasons (Fall and Winter) which means the schedule is 'locked' from early October to Dec. 5th'ish and again from early January to the end of the season.
This means that exhibition can occur as soon as 14 days after Labour Day up to the start of the Regular Season (early October) and over Christmas.
UNB Played UMaine on January 14th, 2014 after playing six regular games after the Christmas break - this is likely the biggest gap/mid-season exhibition game I know of.
There are some seasons after the rule came in where there is a gap at the start of the season (early October), but that was to grand-father in some games that had been on the books with US teams prior to the rule coming into affect.
Most US Teams have adjusted their own schedules and you can get a game in prior to the season (Oct. 1-3 weekend - whenever it is), but it's a logistics challenge now. AUS teams can't play any of the Ivy Teams anymore though - they don't start until the 3rd week of October which is well into the first half for the AUS.
This is another perceived "UNB Rule" - as the AUS team closest to New England - they were getting the most opportunities and were making requests to have 'bye' weekends so they could play double-headers in late October.