Austin Co-Founders Meetup is this Monday
meetup.com
meetup.com
Broaden the horizon a little and include founders who are not looking for co-founders among the networking time.
Try it as an iteration and see if it improves the quality of entire evenings experience for everyone.
That's how it has worked in Silicon Valley: maybe a third of the attendees are there to have a look, get a feel, before they jump in and actively consider joining as co-founder.