Just to expand on my earlier comment about not focusing purely on the bride and groom.
I see so many DJ videos of the end of the night where they have the B&G in the middle of a circle for the whole song with all eyes on them.
Speaking to couples, the first dance is something they are often more nervous about than anything else. Roll onto the end of the night, they have relaxed, had a few too many drinks and the DJ is now trying to put everyones focus back on them for the 3 or 4 minutes of the last song, again having them together alone in the middle of a circle.
I do something which runs along similar lines but doesn’t purely focus on 2 people, rather the collective guests and also recognises those who have put in a bit extra effort during the day.
I often get compliments on how I end the night, and is in fact quite a good marketing technique too
One thing which is a BIG mistake, although something certain people try to encourage, is a staged last dance, in fact anything staged/rehearsed throughout the day/night should be avoided if possible.