A sine qua non to all bachelor entertaining is a chaperon. The married woman can not be dispensed with on such occasions. The host may be gray-headed and old enough to be a grandfather many times over, but, as an unmarried man, he _must_ have a chaperon for his women guests. If he object to this, he must reconcile himself to entertaining only those of his own sex.

The age of this essential appendage to the social party makes no difference, so long as the prefix “Mrs.” is attached to her name. She may be a bride of only a few weeks’ standing,—but the fact that she is married is the essential.

Marion Harland's Complete Etiquette — Part 83

The host, then, first of all, engages his chaperon,—asking her as a favor to assist him in his hospitable efforts. She should accept graciously, but the man will show by his manner that he is honored by her undertaking this office for him. She must be promptly at his rooms at the hour mentioned, as it would be the height of impropriety for one of the young women to arrive there before the matron. If she prefer she may accompany a bevy of the girls invited. To her the host defers, from her he asks advice, and to her he pays special deference. If there is tea to be poured, as at an afternoon function, it is she who is asked to do it, and she may, with a pretty air of assuming responsibility, manage affairs somewhat as if in her own home, still remembering that she is a guest. In this matter tact and a knowledge of the ways of the world play a large part. The chaperon is bound to remain until the last girl takes her departure, after which it is quite _en règle_ for the host to offer his escort, unless she accompanies the last guest, or a carriage be awaiting her. The host thanks her cordially for her kind offices, and she in turn expresses herself as honored by the compliment he has paid her.

Marion Harland's Complete Etiquette — Part 83

Perhaps the simplest form of entertainment for the unmarried man to give in his own quarters is the afternoon tea in some of its various forms. For this function the man must not issue cards, but must write personal notes, or ask his guests orally. He may invite several friends who will supply music. If he have some friend who is especially gifted musically, and whom he would gladly bring before the eyes of the public, he may make the presence of this friend an excellent reason for this afternoon reception. After having secured the chaperon’s acceptance he may write some such note as the following:

Marion Harland's Complete Etiquette — Part 83