When you hold your first meeting, do something so that everyone can get to know each other, even if you already do. I helped start mine 4 years ago, and every new year or when we get a substantial amount of new kids, we like to introduce everyone. So, they would say their Name, Grade, and a weird/quirky/interesting fact about themselves. It helps break the ice, and it also works well to help people warm up to each other.
Hold open discussions. Take a random topic (preferably
LGBT related), start it off, and let people just openly talk about it (in an organized manner of course).
I know the members in ours love guest speakers. If there is a local pride center, or something that you think would do it, ask them if they could come by and talk. We've had people from pride centers, Aids foundations, an awesome gay guy that works for GE come and talk about himself and his company.. etc.
Maybe a movie day? Or a game day?