If a class has been CANCELLED and you need to UNCANCEL the class then you can do so by the following steps-
- Go to Students -> Attendance Maintenance.
- Search for you School Staff Code and the Timetable Date
- Now, select UnCancel Class from the same window and click OK
- The class would be uncancelled.
Note: If classes have been bulk cancelled accidently and you want to uncancell all of them, then you would need to contact firstname.lastname@example.org They can do that in the back-end using a script.