And, of course, Harry Potter and the Order of the Phoenix is set on the 5th year and has a lot more...schoolwork in it than the other books. Shame about Umbridge, but you see quidditch, clubs, hogsmeade, exam classes, detention and even exams themselves.

Edit: if possible, can the OOC post contain:
A timetable (for the sake of simplicity, maybe all houses attend the same lessons* but are separated into house groups?)

A layout of the school

A weather forecast (changed for each new day)

*I also think that each lesson/part of a normal school day should be summarised into one post,** to avoid the whole "stuck on first lesson" RPs that you tend to see. If people want to, I dunno, knock over someone else's cauldron then perhaps they can sort it out OOCly prior to posting?

**Teachers should be able to set the task for their lessons~