If the date was agreed individually or the client can't sign up on their own, you can record it in the system yourself. ActiveNow lets you do this in two ways.
From the calendar
Select the lesson and click Lesson details. Find the Making up absences section, type the participant's name, and click +Add.
Lesson details showing the Making up absences section with a participant search field
From the participant's profile
Go to the Participants tab and open the participant's profile. Find the Making up absences section, click Find a reclaiming date, then click Sign up for reclaiming next to the lesson you want to add them to.
Participant profile showing the Making up absences section with proposed makeup dates
