How do you word important information on your invites?

I would like to make a note on the back of our engagement party invites to explain to friends and family it may be our only opportunity to celebrate with those who won't be at our intimate destination wedding. We are not having an overly-formal wedding. However I don't want to come off sounding rude. So far I have: Our wedding will be an intimate family gathering overseas, This is our opportunity to celebrate with those who won't be with us on our special day. Please let me know how this sounds. Thanks heaps in advance! - Cat