Which preposition to use with centenary

of Occurrences 28%

He told Marty the story of the Student Loan Fundhow it originated in the celebration of the Centenary of American Methodism, in 1866, and how it had been growing all through the years, both by the annual Children's Day offering and by the increasing return of loans from former students.

to Occurrences 1%

My dear Dean RamsayThe attraction of the Scott Centenary to Edinburgh is strong, and your affectionate invitation makes it stronger still.

Which preposition to use with  centenary