I don't know about you, but i often have a hard time getting students to fill out the end-of-day questionnaire.
From experience, I'm not alone in this: FireBrand regularly ping all their trainers that feedback responses are too low and SANS really harp on their trainers and their "facilitators" (teacher's assistant) to get >90% daily feedback.
I explain why giving feedback is important (it helps me improve, which lets students get better value). I add a quiz on the day's topic, so students can test themselves. But in the end, my response rates hover between 20% and 50%. I really don't want to guilt-trip students, so I'd love to hear more suggestions.