This is an idea for how to post the in-journal rps.
When: This means that we can jump around a little in time, and have a bit more flexibility. If nothing happens to our characters for a week, then we don't necessarily have to wait an RL week to post.
Who: This can give us an easy guide to see what characters know what's going on. If, for example, plans are being made for a party for Helga, then Helga can just look at this line and realize that she doesn't need to worry about it.
Summary: Again, self-explanatory.
So, now an example.
When: March 30, 990
Who: Rowena Ravenclaw, Helga Hufflepuff
Where: The manor of Rowena's famaily.
Summary: Helga has come for a visit and Rowena is eager to show off her latest experiments.
If there are to be NPC's, deal with them as needed.
And lastly, I'd suggest using the lj-cut as needed.