When you go back up to the drop-down menu for this heading, you will see links to three kinds of feedback forms: poster, session and detailed. I have posted each as a Word file so you can adapt for your own use, whether for a conference poster or session, another kind of seminar you lead, or, in the case of the detailed form, a full or multi-day workshop. These forms are meant to give YOU feedback so that you can improve over time.
A related idea is to ask participants to evaluate a program, conference or other large-scale educational event. I have posted a template you can adapt in the heading Conference evaluation form template.