Hi all! We are getting married in Myrtle Beach, SC (we're from Pittsburgh, PA) on 5/27/12 and can't figure out when to send our invitations. All of our vendors are requiring final counts 3 weeks before the date, so when would be appropriate to ask for RSVPs?
Thank you!

ETA: Also, our guests will each have to figure out flight/hotel arrangements. We listed options on our website, but there wasn't an option for blocking rooms or packages there. We are also getting married Memorial Day weekend which is a huge tourist weekend there.