This slot is held **only if absolutely necessary**, for extenuating circumstances — it is not a routine class.
(Not a lecture, unless needed.) If the term has run without a cancellation, there is no session this week. If a make-up is needed, it covers whatever was missed — most likely a spillover from final paper presentations or a session displaced earlier in the term.
Source note. (Instructor: confirm before the day whether this session is needed, and communicate that decision by the prior week.)