It's a fun change of pace from birdwatching. And people can be just as entertaining and colorful too, as they go about their nesting, food gathering and flocking activities!
And sometimes illustrators need illustrations of "extras" for backgrounds. An interesting array of characters, footwear, hats, clothes and characters are set before you.
|(Music making, talking, looking and watching specimens)|
|(Food and art gathering activities and specimens on the move.)|
|(Get front, side and back shots before the flock senses danger and scatters.)|
|(Flashy male specimen with plumage)|
...or selling their art?!
Whatever the occasion take time to take notes. As you People Watch, you may get people watching you watching others. It's a great conversation starter. People are fascinated by someone putting pen to paper.
Go to the beach, go to a fair, go to a farmer's market. Get out and people watch and draw them before they know it.