People might invite you to their home or to go out with them for the evening.They might invite you when they see you or by telephone. However,it is still quite common to be invited by letter or by invitation card. The invitation will tell you what the occasion is,when it is and, occasionally,what you should wear! People might invite you to their home or to go out with them for the evening. They might invite you when they see you or by telephone. However, it is still quite common to be invited by letter or by invitation card. The invitation will tell you what the occasion is, when it is and, occasionally, what you should wear!