I just became engaged and the engagement period is very short (we are getting married at the end of this year). I would really like an engagement dinner for all the parents and the wedding party. The idea is more for all the parents to meet and everyone to get to know one another since they will be the most involved people at the wedding. I already picked a local mexican restaurant that isn't by any means expensive. However, seeing as my fiancee is still in college and I just graduated, plus we are paying for the entire wedding ourselves....I really can't pay for anyone at this dinner. It's optional for anyone to attend. Is there a polite way to put on the invitation that this will be at their own expense? Or is the whole idea just wishful thinking?