Auditorium Pinback Button Purple Elk Deer Pin Vintage 1920s? University Event?

Vintage pinback button that reads Auditorium with an illustration of a deer or elk head in purple. Im not sure of the meaning behind the pin. Perhaps relating to an Elks lodge? Or a college or university event? It was found with a group of pins dating mainly to the 1920s and 1930s. It shows some overall wear such as scratches and finish wear. Location: 86