I've never heard of or found anything about Peter Green meeting or playing with Gabor Szabo, but I am a fan of both as well as at least some of the Santana lineups and alumni. I have a huge vintage magazine collection and nothing has turned up in them (Beat Instrumental etc.) I think I have all the Szabo LPs now including the Chico Hamilton ones he played on; some really fantastic explorations!
http://rockaeology.com/2011/05/06/be...gic-woman.aspx