Week 9 is the week of 5/16.

Due to B & C having an odd number of teams, there is no way to play a 9 game regular season with each team having played exactly 9 games (one would have to have 10 or 8).

What I will do is wait until the week before and figure out who has been eliminated (i.e. won`t make the top 8) from B & C and schedule one inter-division game for two of those teams.