Found it
Devils Lake, ND. Address to an American Legion convention.
From The Bemidji daily pioneer., June 21, 1922, Page 6
And a big thanks to the Library of Congress for scanning so many newspapers and putting them online for free.
Amazing schedule for landis. On the 12th he was in Chicago, North Dakota on the 21st and 22nd, then off to Boston to lecture the players about behavior on the 27th.
Steve B