I agree with Hughes that we all need to chill out a bit...
Me and Hughes telling people to chill? God, things HAVE changed.
Seriously though, this is a two-way street. The community is clique-y, and we can't change that. People are going to be friends with and go to events with the guys they always have. This is why EvoMN, MitsuStyle, and MN3/S stuff really doesn't have much crossover attendance, and it's just part of how it's going to be. Posting events alone really can't fix that, and if your audience is a group of people that's not interested in the activity or attendees, financially tied up in other things, or is busy with work or family, it's not going to take off.
Effectively, you can want to put on an event, which is awesome, and good on you, but the community also has to WANT that event, which is the hard part.