How do you respond to Bar Mitzvah invitation if the response card is blank?

Answer:
Assume that the card is left blank so that you may write a brief note expressing your good wishes and congratulations and whether or not you will be attending. Many families are now opting for this more personalized type of RSVP card in lieu of the more formal yes/no cards of yesterday.
First answer by Alcohen2006. Last edit by Rachael113. Contributor trust: 0 [recommend contributor recommended]. Question popularity: 3 [recommend question].