I have to concur that while contacting other attendees you are interested in beforehand is a good idea, your plans probably won't be realized. However, it does give you someone to talk to at the party and that is a real plus. You are always more interesting to other couples if you are already engaged with other couples. If you've corresponded with 5 or 6 couples and are engaged in discussions with some of them, other couples will say, "Hey, those folks must be interesting. Look how many people they know." It adds to your allure!
Have fun and just do what makes you comfortable. That's the golden rule of swinging.

