So, guess what I forgot to do? Manga P4V5!
An Exciting Morning covers the beginning of the chapter Onward to the Library. The LN doesn't need it, but for the Manga, it fits in between Wilfried and Roderick and To The Library!
Then we have Wilfried's An Update on Rozemyne's Classes. For the LN, this fits in the gap between Schtappe Fundamentals and Meeting for the Tea Party. The only issue is that we've got two more POV chapters in that gap - an Epilogue (a cutaway to Ehrenfest), and a Prologue (Solange on the day of the Schtappe Fundamentals class). Technically, I don't think there's anything in the chapter that says if it should be before, between, or after the other cutaways... But my gut feeling is that it'd probably work better after the Prologue, as the lead in to Meeting for the Tea Party.
In terms of the manga, it fits in the middle of Passing Schtappe Fundamentals, so will be placed after it.