You will need to note who or how many attended, weather it was successful, were your residents happy with the outcome. Did they state they would like to do it again. It also helps if you record the steps and requirements to hold the activity , as in equipment, setting up the area. If it is an outside activity you will also have to do a safety audit and facilities check. I hope this helps.
This site is amazing! It has helped me so much over the last couple of months. My residents are big fans of your Arm Chair Travels. Keep up the great work!