Ask HN: How to promote organic diversity and escape a cultural echo chamber?

Greeting HN, I have a short narrative if you're interested in where I'm coming from. But first, my question is simply, "What are some great ways to meet people who come from different backgrounds but share an interest in technology and especially computers?" Most of my friends are white, heterosexual (as far as I know) cis-gendered males. Some of them are white, heterosexual (as far as I know) cis-gendered females. Only one of them is trangendered. And I'm probably the only one who's gay. We all met in community college-- at first, through a LARP group, then one of my friends started teaching us martial arts and letting us hang out at his place. Fast forward six or so years later, we're looking to start our own businesses in the near future. My friends are all incredibly progressive, open-minded people and I'm not worried about discriminatory behavior. My concern is that we'll find ourselves in an echo chamber (much like I hear people in Silicon Valley find themselves in, presently). Naturally, I'd like to meet people with all sorts of personalities and heritages, but I'm not sure how to go about it in a way that doesn't feel artificial-- like I'm seeking them out "because they're different". At the same time, if I start a meetup and open the floodgates to everyone, past experience with Orlando technology meet-ups leads me to believe most (if not all) of the local attendees will be straight white dudes every time. Is this a legitimate concern? What should be done about it?