Best way is to have parties on a regular schedule so people just know where to go for a good time... I had a Wed night party for 100 weeks in a row. We had 300 people show up every week, never invited any of them.
But if you are just going to do a 1 time shot party, then you need to hype it. Have to have people talking about it and get past the "I might show up" phase into the "Hey, you going to that party too?"
If you can get guys using your party as a pickup line, then you are ready to go.
Just invite girls. Every girl you can find. Make sure that guys here about the party from girls. Tell your guy friends they need to bring girls to get in
