I think a slideshow would be a great idea. You could assemble a TON of pictures from the last 50 years and have it playing in the background at a fancy dinner.
You could also have awards or some type of recognition for alumnae who have helped your chapter throughout the years. I don't know if that would work, but it could if you have any spectacular ladies in mind.
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On the heart of each sister
lies one 0-----,, that binds us
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