You may want to check out the BSP website link at the bottom of my signature and see if it is for you.
There is a thread on the the Alum forum that lists all of the sororities that do AI.
BSP is non-academic Service Sorority (even though there are about 2 on chapters of college campuses). The age ranges are 18-90+. I have met members that have 60-65 years of service in Beta. We do have formals that significant others are invited to and other sisterhood events.
Good Luck - hope that helps.
