I know they're not supposed to go out until about 8 weeks in advance, but I'm sending them early anyway - about 75% of my guest list is way outa town (Oregon, Argentina, and the like), and I couldn't afford to send Save The Date cards, so I want them to be able to get travel stuff taken care of in advance.

Plus, I know my friends. If I don't warn them now, they'll all wind up preregistered for a con or an SCA event that weekend.... :)