We sent out save the dates via facebook (small wedding of just family and close friends). Guests were given dates, city location (we are having the wedding locally), and the time. 95% of guests RSVPed yes on facebook. The formal invitation has gone out and no one has RSVPed. One of my bridesmaid said she didn't even see the RSVP info (it was to RSVP to a specific email address). I thought perhaps no one paid attention to it but it was too obscure on the invite, but MIL says it's clear. How do I remind everyone without being pushy?