If you live in the same city as your high school, call the administration and see if you can set up a 'career talk' with some juniors or seniors. Or perhaps, just see if there are any career exploration events going on at nearby high schools, colleges, universities.

Of course the easiest thing to do that will make you feel accomplished in actively recruiting would simply be to put up flyers around coffee shops and any other gathering space of people. Wealthy neighborhoods are the best of course.