When cleaning out my Pile O Negatives, I've been returning negatives to people when I have a pile of them of that person. This means finding people I haven't talked to in 10 years. Each person has been excited to have those photos.
This experience had led me to take more photos of people. As a result, I have been discovering that another way to be a friend is to take photographs at special events. It can be a photo of something they made:
It can be a photo of the group:
Or it can just be of the fun you're having together: