Go to any local yacht club, or racing events and pretty soon you'll have people asking. A lot of other people feel that they shouldn't ask because it'd be too much of a bother or too expensive or annoying for you. Just keep asking people if they want to go out.
But most of important of all. If you want to get someone into sailing, let them sail your boat! Don't let people just be passengers because they are afraid of screwing up or hurting things. People think sailing is boring because they don't ever get a chance to make decisions and see what they can do to affect things on a boat. Explain sail trim and then make your guests do it right! Show them what they are doing is affecting something and most people will get excited. At least that's my two cents.