The attendance grid provides a graphical view of all attendance for the events created in your portal. For each user, you can view the total number of events they attended or missed. Start by visiting the Events tool in your portal then look for Attendance on the right side of the page.
At the top of the grid you'll find a key, which displays the color that belongs to each status. On the left side of the grid is the list of users and their attendance totals. To the right of each user is their status at each event where they've been marked. Hover over a day where a user has been marked and it will indicate the corresponding event.
You can also view the attendance grid for individual events. Navigate to an event, select Participation, then choose Attendance Grid from the grey toolbar. This tool can be very helpful for repeating events.
At this time, there is not a reset option for the attendance grid.