Get your bike off campus after commencement, unless you want the TUPD to take it off your hands. I'm not sure if UNO, Loyola, Dillard, or Xavier do anything similar, but you might want to check just to be sure.
From Tulane (via a friend's e-mail):
Annually, following Commencement, police officers on the uptown campus remove bicycles locked to fixed objects (bicycle racks, handrails, trees, etc.). Abandoned bicycles take up valuable space on campus bicycle racks, and they tend to attract an unsavory element to campus. This year, bicycle removal will occur over a two-night period, May 19-20. Removal is accomplished between the hours of 8 p.m. and 6 a.m.
Faculty, staff and students commuting to campus by bicycle should not allow their bicycle to remain on campus during the dates and times designated for removal. Students residing in uptown residence halls will be allowed to secure their bicycles in their residence hall rooms during the dates and times noted for removal.
Tulane University Police Department