Grandville principal celebrates May 4 dressed as Darth Vader Casie Bunce and last updated 2021-05-04 16:13:43-04 GRANDVILLE, Mich. â A principal in Grandville was feeling the force Tuesday. Principal David Martini of Cummings Elementary School dressed up as Darth Vader today in celebration of his favorite day of the year: May 4. Principal Martini spent the morning greeting students in full costume as they arrived at school. Casie Bunce