DO YOU RSVP? What does it mean?
RSVP is French for respondez s'il vous plait meaning "please reply." This is the #1 complaint I hear all the time: people don't respond to business or social engagements or volunteer meetings.
Be unique and let someone know if you can or cannot attend. RSVP means you contact the host to let him/her know whether or not you will be there. "Regrets Only" means you call ONLY if you cannot attend (NEVER USE THIS PHRASE! You will not get an accurate account of attendees.)
Remember, look at the e-mail or invitation to see who is actually invited; never show up with an uninvited guest.