You should all have recieved an invitation with this text, I hope you can participate! :-)
I hope you've all landed after the final examination and that you're satisfied with the course! In order to make a better course for the coming students I would like to invite you all to an evaluation of this course.
I know you're busy those days, but I hope you can find time to participate! (If you would like to participate, but the timeslot is occupied: Please let me know!)