How to keep my guests entertained during the reception

I’m starting to plan my wedding and I’m worried about keeping people entertained during the evening at my wedding, my ceremony and reception are being held at one venue and I’m not having any additional guests for the evening so everyone that arrives for the ceremony will be staying right through until the evening. Obviously we’ll be having the wedding breakfast, first dance, cake cutting etc and I’m having a Dj so hoping everyone will be dancing and just enjoying themselves but I’m just wondering is there anything else people have done at the evening reception to fill time? Also my venue says you can stay until 12 so maybe ending a little earlier would also help as I can’t imagine many of my family or friends would actually stay until 12? For context my wedding is more intimate at 40 guests. Any help would be appreciated ☺️