We have variety dances twice a month and include the line dancers. There is etiquette for line dancers and couples and each group has been trained in where they are to dance. Sometimes the line dancers fill the entire foor but the couples dancers understand it will be only for one song and either sit it out or most actually join in. There is a sheet that shows dancers etiquette and where to dance on the social floor.
We have trained everyone to be aware of the rules and everyone is respectful of the others.
A couple of times a year we put out the sheet to remind everyone.