We are here to meet people so we're always up for that if an opportunity comes up. We and some of our friends have house parties so, if a couple is a more-the-merrier type we ask if they'd like to attend our party and sometimes we get asked by a couple if we know any local parties to attend. At least one of our friends has said, "If you like someone, feel free to bring them to our party."
This is of course assuming that we know that a coupe is at a similar play-grade as us and the other attendees. There are a number of people we like that aren't ready for some of the parties we attend.
We have also had couples express an interest in expanding their circle of friends so we'll sometimes have a couple like that over with 1 or 2 other couples that we know and think they might like. There are no expectations for the new couple and we let them know that we're likely going to play at some point, but they aren't required to join in unless they want to.

