The Ticats lead the season series with the Argos 1-0 after a win at Tim Horton's Field earlier in the year. With three games against the Argos this year, the Cats can secure the Harold Ballard Cup award to the winner of the season series between the teams. The Cats won the 2014 Harold Ballard Cup and the 2014 Labour Day classic 13-12 in a nail bitter.
Harold Ballard of course was a former owner of both the Cats and the Argonauts. Probably more important for the Cats than winning the Harold Ballard Cup (although that would be awesome) would be that the Cats would lock up the tie breaker with the Argos in case they finished the season with the same number of points. With both teams sporting 6 and 3 records that could be important for who hosts the East final. Given the Cats record at Tim Horton's stadium, hosting the final would definitely help their Grey Cup chances.
I'm always a little surprised the Cats don't make a bigger deal about the Harold Ballard Cup (it isn't even on Wikipedia).