This section of the book is from the "Household Companion: The Home Book Of Etiquette" book.
A dinner, either at home or at a restaurant, is frequently followed by a visit to the theatre or the opera. In such a case it is proper for the one who gives the theatre party to invite an equal number of ladies and gentlemen, a proper chaperon, of course being provided. If the party are to dine together before going to the play, half-past six is usually the hour appointed, whether the dinner is to take place in a private house or in a restaurant. If there is to be no dinner, some house is selected where the guests assemble at a proper hour to reach the theatre in time.
It is customary, when you invite married people or gentlemen to the opera, to send them their tickets so that they may join you at the opera house, unless for some reason you wish to go with them. Unmarried ladies are usually asked to dine by their friends and go with them from their home. Suppers are rarely given after the opera, owing to the lateness of the hour. If the party did not dine together, however, it is customary for the host or hostess to give the guests a supper somewhere after the play.
It is the duty of the chaperon to see the unmarried ladies safely home.