My fiance and I are having a DW later this year and all of our guests will be traveling. We are planning to send a save-the-date, but I'm wondering the best way to go about it. A friend of mine had a DW last year and sent a STD letter along with a preliminary card to get an idea of who planned to, maybe planned to but needed more info, and didn't plan to attend the DW but wanted to attend the local celebration. The preliminary card was returned to the couple with guests' most current plans, and the couple anticipated that people could change their minds. We really like that idea because it gives a slightly better idea on number of people that are considering attending, but we know at this point that we will likely mostly maybes -- so is it worth it to send a letter/preliminary card, or do we just send a STD announcement and leave it at that?