Yes, on the Event Attendance grid (Workspace > Events > Event Attendance) you are able to both Check In and Check Out each individual attendee. On the grid, locate the "In" and "Out" columns. Find the desired Attendee and check the box on their row under the "In" column. This will then add the current Date and Time under the "In Time" column. The same will happen if you check the box under the "Out" column.

To check in/out multiple attendees, filter the grid as desired using the column settings, and click on the person icon at the top of the grid. The left check in will check everyone in on the grid at the time shown in the box. You can also undo the check in the the undo icon to the right of the time box.