Learners are not required to schedule a session if they don't have specific question(s) in mind.

However, as space is limited, they will be withdrawn to leave spaces for other learners who need this resource more.

There is no clear cut line to the withdrawing policy, but I would say something around the lines of exceeding a total of 3 absences in a row or having 4 total absences or more within 2 months would be as a clear indication).