Some PTA furnish family directory's if you join them. PTA is nominal fee and greatly helps out your school. It is a great way to net work with other parents. If you can a list of names and numbers call or send out emails. My girlfriend just keeps asking over and over again until the the finally just show up. Ihave yet to try that, but she does have way more firends than I do. With her it is easier just to be her freind than be stalked by her. Thankfully she is really fun.
Also invite parents over without the kids for some coffee 9r something, that way they can get to know you and be more apt to let their kids come to your place.
Point is you need to be approachable. And' don't worry abot the boy girl thing.