The essay rewrites are optional and will not necessarily help everyone grade-wise. They are also revisions, that is, improving on what you have already done. In addition to responding to comments, you will need to make some of your own improvements as comments don’t focus on everything.
If you are not rewriting an essay tomorrow you may prepare for the last seminar, make a few corrections on the Lippmann essay (5th and 6th only) for a few points added to your grade. This is for people who earned a 4 or 5. I don’t think it’s that beneficial for anyone else. You may also spend this time on your memorization. And if you are fine with everything, you may study for other finals or read after you have read the passage for the last seminar.