1- Yikes--yep, the A is indeed missing.

2- Good question. I don't think the comma implies an independent clause. This one is tricky--it's a list, but I can't make it parallel without saying "after you've submitted your peer assessments, you've submitted your self assessment, and your peers have assessed your response" (which is too wordy) or "after the peer assessment and self assessment steps are complete" (which doesn't specify that PA has two parts). I also felt that just using "and" makes the sentence feel like it's running away, so I wanted to give readers a mental break. I could be OK with taking it out if you feel strongly about it. :grinning: