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.
Once again Golden Carers has come to the rescue. I live in a retirement village and calling on my years as a Diversional Therapist I constantly use the Golden Carers for new ideas to run my group in the village. I especially love the Read Aloud Audience Participation activity and I always pick a very shy resident to take a part. It is amazing how much it brings them out of their shell. The quiz always helps keeps their minds active and gives them such a feeling of self worth when they get a correct answer.