Getting married at a camping retreat that I have attended for the past several years since most of my friends will already be there and it's a gorgeous setting. Going to have it at night (after dinner before drum circle) so the ceremony will be candle lit with a dessert buffet afterwards. Question is, how do I send out invites to people that I've known for years from being at this twice a year event? I rarely see them other times of the year and some come in from out of state to attend. A friend suggested I send out regular paper invitations but then could I have them RSVP on-line somehow, send back a RSVP card or I even saw one service that does it via text on a phone? There are usually about 500 people at this event and since I was on staff for the past couple of years I know over half of the attendees. Help!!!