Maybe you're in an area with just a few challenge dancers at your level. Often regular workshops are canceled because of sickness, or perhaps because one or more members are out of town. We believe it's more than three times easier to recruit two other people than to find six others for a full square. In these situations Two Couple Dancing becomes an excellent alternative. Often it can be the difference between dancing and not dancing.
Many dancers find themselves workshopping alone, either one person or one couple.
You'll find it considerably easier to accomplish this with 2 couple material than with material called for an 8 person square. Here's another application. Let's say you're dancing C1, but you have a couple of friends who are taking C1 lessons. Two Couple Dancing provides an excellent opportunity for you to help them accelerate their learning curve without the necessity of recruiting a full square. They can be attending C1 dances with you in much less time.