Northernfeet there arent groups per se, but i can recommend websites like swinglifestyle.com where you can post your profile. it's like a dating site but for couples (and horny single guys which you can block if you want). they also list local events for meet and greets. those can be fun and who knows, maybe we'll run into you there and you'll recognize us by my wife's feet
also, you could try club leisure time in hartford, but that would be a little more difficult for just foot action. most cpls there are there for the actual sex, but the hosts, kevin and kari are really cool.