Looking for story advice

Hi everyone! I'm working on a story called Square Dance Stand In, but there's a couple of snags I've run into.

The first is, does anyone know of any square dancing that only uses two couples? My story has two couples, but then I thought I remembered there being four couples ... and now I'm not certain of either. Also, the main character is supposed to stand in for someone else to help the others prepare for the contest, then eventually get roped into entering the contest, but is that too predictable? Any suggestions on how to make it a little less predictable? Would it help to post what I've written so far to be able to answer my questions better?

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