To elaborate, in the US, existing groups tend to be narrow and uninteresting to me. In most places I've lived, it's basically a mix of sports/fitness groups, art groups, "tech" (i.e., programmer; traditional engineers like myself won't feel entirely welcome), social dancing, popular fiction reading group, activism, etc. I can't say that any of these genuinely interest me and/or would be a good place to meet people. At a fitness class, for example, many people aren't interested in casual conversation as far as I'm aware. And without genuine interest in the subject, it's hard to engage.