I volunteer at the Boston Museum of Science on Sundays and we also track how many people we interact with at the various activities. We log by group, so log might read "1 man, 1 woman, 2 boys, 1 girl (family)" or "3 women, 10 girls, 12 boys (school group)"

It's really handy to see how many people the activities attract, and who they appeal to most. You're tracked everywhere!