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.

NOTE: To check in/out multiple attendees, filter the grid and click on Check-in all or Check-out all.