I've been to such event, though wasn't a regular and it was more of an alternative gathering. That was before all the web services, but nowadays there's ie. meetup, and college/university is bound to have something too: https://www.meetup.com/topics/philosophy/

Meetup could be a good place to connect about lots of stuff. Don't be surprised if the thing finds you, but one need to be open to try new and unplanned experiences.