I just made a facebook event inviting people to come out Bowling with me at the weekend and get drunk but never know how the etiquette works when it comes to inviting people

like if there's a group of people who are friends, but i'm only really friends with some of them how can you invite some but not others? in the end i've gone for inviting a lot more people than a) i really want to come and b) the 2 lanes i've booked can handle!

arghh politness sucks