If a friend, business partner or associate sends a birthday or marriage invitation card to you, be sure to read the information contained therein, and do not overlook the section for RSVP. Courtesy demands that you RSVP to affirm you will attend or not. RSVP helps the host plan for his/her guest. If you are sure you will attend and vice versa, it is proper to RSVP else you make planning difficult for the host. Correct?