I know your problem well. A couple of weeks ago I had four people, so I
started to teach them a Hullichan. That was fine until another two people
turned up late and wanting to dance. The original four were just begining to
get the hang of things, but weren't confident enough to leave it and come back
to it next week. So I ended up getting them to dance it in a circle rather
than a straight line. Luckliy the next week I had four again and so was able
to do it the proper way.
It has also been a problem when trying to practice dances for specific events.
Most of the dances on University programs this year are definite four couple
dances, which makes them hard to teach with a three couple set. And you can
gaurantee that the week you get 4 couple is the week you have decided to give
up and only teach the three couple dances.