Hello Laura,
I like your incentives.
At my institution, we have a strict attendance policy. If a student has more than 8 hours of missed time in a class due to tardies and/or absences, the student will be withdrawn from the course. A tardy counts as 1 hour of missed time, and an absence counts as 2 hours of missed time. If at the end of the grading period, a student has perfect attendance and an "A" average, the student will be exempt from the final exam. Students really strive hard not to be absent or tardy, and they work… >>>