Indeed, Bix and Bunny were together in college dates. In my Bix piano compositions article, I point this out.
"Bix and Bunny knew each other. They played the Senior Hop at <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />Amherst College on March 14, 1931 with the Dorsey Brothers Orchestra. Other musicians in the band were Glenn Miller, Arthur Schutt and Carl Kress. According to the Amherst College student newspaper, The music was furnished by two bands, one led by Bix Beiderbecke who alternated with the Dorsey Brothers orchestra under the supervision of Tom Dorsey. The smaller of the two, Beiderbecke's, is considered one of the best five piece outfits in the country.[12] Bix and Bunny played again with the Dorsey Brothers orchestra at the Beta Theta Phi House, Yale University on May 15, 1931."