Our wedding isn't until August 18th, 2018. What is the difference between Save the Dates and Invitations? Which one should I send. I don't know how many people will be coming to our wedding and because of that I don't have a Venue yet for it to be placed.. should I send a save the dates so I can have them RSVP and then send invitations closer to the wedding when I have a venue? How is everyone else doing it?