It takes time for people to let it sink in for an idea to go someplace and meet up; especially if it involves overnight travel.
The more people talk about it, the more others want to be involved.
The three types:
1. They'll go because they know they would have fun.
2. They'll go if they know their friends are going.
3. They'll go if funds and time is available.
So, promote, promote, promote, and get people to talk about it.