Not aroace, just weighing in from a perspective of when I've been the single in a room of couples, hope that's OK. I would be comfortable with this if I was friends with the couples, and could hang out with each person separately. Couples who I don't know, who are more likely to hang out on their own, I would be shy around. What you described sounds awkward unless you're very confident around strangers. I would totally go for this if I knew everybody or even most of the people but in your circumstances I'd pass!