An activity that involves peer assessment has a number of
sequential phases. Immediately after the deadline for the
submission phase, the submissions are randomly allocated by the
system for assessment. It's not possible to plug in a late
submission after the activity enters the assessment phase. Then,
right after the assessment phase, the activity is closed and
everyone can view their assessments. Again, it's not possible to
plug in late assessments once the activity is closed. Because of
the way this activity works, we cannot extend the deadline for
either the submission or assessment phase. So please do not ask
for extensions!