RSVP Facilitator is a job title that requires the individual to manage the process of responding to invitations. This includes collecting responses, tracking RSVPs, and ensuring that all guests are accounted for. The acronym SASE stands for 'Self-Addressed Stamped Envelope' and SAS stands for 'Self-Addressed Sticker'. These are both used to facilitate the RSVP process by providing guests with an easy way to respond to an invitation.