<p align="center"><b>Attendance</b></p>
<p align="left"><strong>Hidden sessions</strong></p>
<p align="left">Session hides if course's start date older than its date. 
Change start date of course and hidden sessions will be shown.</p>
<p align="left">You can use this feature to hide older sessions instead delete. 
Remember than only visible sessions using in Gradebook.</p>