i think teens instinctively kind of find each other.
school, after school jobs, hanging out on weekends, church (if thats your thing)... all that jazz
i wouldnt have a party. id have been mortified and an outcast if my folks had tried to do that to me! and no way would i have gone to a party with my folks! not if i had any say about it. blech... (i may be in my 30's now but i definitely remember these things! LOL)
look on meetup for preschool groups, or again, church, stuff like that.
it all falls into place. dont try so hard.