I don't know anything about Epsilon Xi, but I was the Fraternity Heritage Chair for '08-'09. I found it a bit difficult because 1) we were colony, so I hadn't seen a Fraternity Heritage Chair in action, and 2) because since we were a re-colonizing chapter, I didn't know where to look for history.
We had this event during Panhellenic Pride week where the library opened up some Greek archives (or something like that) for Greeks to go and look at. They had some old books that our chapter was included in, so I found some stuff there. So maybe try your library? Good luck!
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