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Setting up for live radio broadcast, August 1922. See

Cockaday is Laurence M. Cockaday, a radio expert who had written a book on the subject in 1922. Here's a review: "Radio Telephony for Everyone," by Laurence M. Cockaday
(Stokes), Is a clear nontechnical explanation of the working theory of radio in general, and the receiver and transmitter in particular, so that the boy of sixteen and the man of sixty will read It with equal interest and satisfaction.
Mr. Cockaday. technical editor of Popular Radio and The Modulator, has studied and worked in radio telephony for fifteen years. He built one of the first broadcasting stations In the United States. During the war he served as radio instructor in the navy, and while there Invented a radio transmitter extensively used during the war. His position as technical editor on radio publications keeps him in touch with the latest developments In the field, so that readers of hls book are certain to find definite, up-to-date Information upon which to work."
The Washington Times, July 16, 1922.
chroniclingamerica.loc.gov/lccn/sn84026749/1922-07-16/ed-...
Cockaday is pictured elswhere in the Bain Collection, along with Kendall Banning who, like Cockaday, was editor of Popular Radio Magazine.:

Dr. E.E. Free (Edward Elway Free, 1883-1939), was a scientist and science journalist. His November 1939 New York Times obit began: "DR. E.E. FREE DEAD; EDITOR, SCIENTIST; Former Head of the Scientific American Aided in Discovery of Potash on Coast OVERCAME WILT IN PLANTS Conducted Studies That Led to Anti-Noise Campaign of Mayor La Guardia. Dr. Edward Elway Free, former editor of The Scientific American, who was noted for popularizing scientific subjects, died Friday night at Post Graduate Hospital, where he had undergone an operation. He had been ill for two months. His age was 56." nytimes.com/1939/11/26/archives/dr-ee-free-dead-editor-scientist-former-head-of-the-scientific.html timesmachine.nytimes.com/timesmachine/1939/11/26/94744472...

Kendall Banning (1879-1944) pennyspoetry.fandom.com/wiki/Kendall_Banning www.findagrave.com/memorial/30211250/

Art Siegel B-59 Thank you for the information on the three men pictured.

See comments with

In the Lewisohn Stadium (demolished in 1973) en.wikipedia.org/wiki/Lewisohn_Stadium

See for details of the event shown here.

It was in the Lewisohn stadium of CCNY, now demolished>
en.wikipedia.org/wiki/City_College_of_New_York#Lewisohn_S...

This must be the "parade and demonstration of the work of the Third Ambulance Company of the New York National Guard and the nurses unit of B. Altman & Company" described in query.nytimes.com/mem/archive-free/pdf?res=9C01E5D7123BE0...