No gentleman may ask a lady to dance without a proper introduction.
A lady must remain with her chaperone (her mother or a married family friend or relative) except when she is dancing.
A request to dance was for always a pair of dances. At the conclusion of their two dances, the gentleman must conduct the lady back to her chaperone unless it is time for supper, in which case he may attend her to the supper room.
No lady may cross a ballroom unattended or leave the room without her chaperone.
A lady may not refuse a gentleman who asks her to dance unless she already has a partner for the dance.
A gentleman may not ask a lady to dance more than twice in the same evening even if they are engaged to be married.
A gentleman may not refuse a request from his hostess to dance with a particular lady.
Now:
In social dancing it is customary to change partners after each dance. This helps to give everyone a chance to dance.
It's okay for women to ask men to dance or for two people of the same gender to dance together.
Beginners will do better with an experienced dancer for the first few dances.
It's a matter of courtesy not to accept a request to dance after you have refused someone else.
When you've found a partner, always join in the set at the bottom.
Listen carefully and quietly to the caller's instructions, even if you already know the dance.
Ask questions before the dance begins if there's something you don't understand.
Smile at your partner, corner, or neighbor and look him/her in the eye when you do a figure together. Remember, you are dancing with everyone in the set, not just your partner.
Never grab, push, or pull other dancers in the set. Hold out the appropriate hand, use eye contact, or just say a quiet word to help others out.
Don't squeeze hands or arms, but give the appropriate weight when doing a turn or similar figure.
Listen to the music and watch the experienced dancers to help you begin and end the figures at the appropriate time.
Good dancing is not about showing off as an individual, but about being a considerate, supportive, and appreciative part of the set.
Everyone makes a mistake now and then. Don't panic-just smile and try to get to the right spot with your partner for the next figure.
Enjoy yourself, bow to your partner when the music stops, and thank him/her for the lovely dance.