Ffff, sorry for the all these posts. But here's how the Quidditch matches were chosen and how they're set up.
WARNING: Your mod really likes to explain things with crappy charts and Sharpies.
Apologies in advance.
Samzilla was kind enough to make something light years better. All hail the 'Zilla.
EDIT: MATCH SCHEDULE
MATCH #1 - WEDNESDAY
MATCH #2 - THURSDAY
FINAL MATCH - SATURDAY
ALSO
HOGSMEADE TRIP - FRIDAY