I have done ARQs with a 120 intro psych students. Instead of grading everyone just tell them that you will randomly grade 25 each time. Another idea is to do what we call "Reading Check-Ins" or "Comprehension Checks". Just a short multiple-choice or T/F low-stakes assessment with tops of 4 to 5 questions. I do this and make them worth about 10% of their overall grade. I then use some of these questions on the Comprehensive Exam. It gives students some incentive to do them. Just a few thoughts.