Changes to Websites after Entry?

Are we allowed to make changes to our team websites after it has been entered into the TIMS and the due date has passed, or do we need to cease work?

I think you can keep on working on it, but you should remember that judges may begin to evaluate it right after the due date (so they might not see your changes).

They do allow, and encourage, changes after the 20th. The judges may or may not see them, though.