Additional research

Do a little web research, I found some information on the person who sent the telegram to my grandfather. His name was Everett Sanderson of Fostoria, Ohio. From the web:

TED LEWIS IMITATOR PLAYED THREE INSTRUMENTS AT THE SAME TIME

One of Sanderson's great feats was to play three instruments at one...two clarinets and a saxaphone. It may seem quite impossible, but Duffield knew Sanderson personally and vouched for the authenticity of his ability.

The period of time in which Duffield knew Sanderson was when he (Duffield) was first starting his music store. Sanderson was aged then, with no income, but played at the Black Cat, his pay being free meals. Duffield kept Sanderson's instruments in repair for free. Sanderson's instruments came to the Museum through Duffield.

Also found some information about the person who was apparently the booking agent for Walt Fensch's Ambassadors, Phil Premy (see the handbill on this page). He was a lightweight boxer from Mansfield, who fought in the late 1920s, and — most likely — did other promotons and events throughout the Mansfield area.

More info about Sanderson:

http://www.fostoria.org/history/Krupp/1986/dec_4__1986.html