<p>If you look at the graduation info here: [Cornell</a> University Commencement - Graduation Weekend, Campus Interests](<a href=“http://commencement.cornell.edu/May/interests.html#m]Cornell”>http://commencement.cornell.edu/May/interests.html#m)
they list tours on Friday and Saturday of graduation weekend, but not on Sunday. Looks like you’ll probably be out of luck</p>