One thing I learned in the past was to try to spread the word about events [Initiation, philanthropy events, etc.] WELL IN ADVANCE if it's possible. I remember having alumnae complain that we didn't give them appropriate notice once!

For the parents, in addition to what lionlove mentioned, try to include some little facts and tidbits about your organization or your chapter. I know on our official AGD website there's a special section for parents giving them tons of information about AGD.