For a social dance to be enjoyable for all participants, it is crucial to be considerate & aware of your floor craft. No matter how much you may want to swing out, on a crowded dance floor your primary consideration should be respect for the other couples on the floor. You don’t have to dance big to have fun.
At times, collisions do occur in the heat of the moment. When there is a collision, everyone involved should stop and apologize, regardless of whose “fault”, it was. If someone has been hurt, you should make sure they are okay before you resume dancing. If necessary, escort the person off the floor to a chair and see if they need ice, a drink of water or medical attention.
Careful observation of the traffic lanes in a ballroom can prevent mishaps. In Waltz, Foxtrot, Tango, Quickstep, and Samba, dancers move in a counterclockwise circle around the floor. This circle is known as “line of dance”. The very outside lane of the line of dance is the “fast lane”; it is generally used by very experienced dancers who cover a great deal of ground. The inside lane is for less experienced dancers who may be moving a bit more slowly. Beginners and those who would like to practice the basic steps without traveling can stay on the inside of the circle, out of the line of dance completely.
Also -- It is considered inappropriate to cut across the dance floor, especially when carrying food or drink. And also, remember to move off the dance floor when engaged in conversation.