Link to the doc: link
All of the information you need is in that document. Please read it thoroughly before asking questions on Piazza. The deadlines and rules are strict. We will not be allowing any exceptions or doing regrades except under extraordinary circumstances.
The extra credit assignment has two deadlines: the first deadline is for when your work is due, and the second deadline is for when you must finish peer reviews. Missing either one will result in 0 points being awarded