Every Friday the 13th, the Brown University Library celebrates Carberry Day.
From the Encyclopedia Brunoniana:
On Friday, May 13, 1955, an anonymous gift of $101.01 was received by the University from Professor Carberry to establish the Josiah S. Carberry Fund in memory of his “future late wife.” A condition of the gift was that, henceforth, every Friday the 13th would be designated “Carberry Day,” and on that day friends of the University would deposit their loose change in brown jugs to augment the fund, which is used to purchase “such books as Professor Carberry might or might not approve of.”