One of the listed featured performers in this advertisement is soprano Alberta Gillam, who was married to De Witt P. Gillam, who in turn presumably was related to Manley M. Gillam, the President of the United States Telephone Herald Company and one of the directors of the Oregon Telephone Herald Company.

Link to scan of the original newspaper page.
The Sunday Oregonian, June 30, 1912, page 5.
Oregon Telephone Herald