330 ILCS 115/3

The main or principal hall of such memorial building shall be a public hall, in which non-political public meetings may be held under the direction and control of the directors of the said Soldiers' Home, and the sanction and approval of the mayor and common council of the city of Chicago: Provided, however, such public meeting shall not interfere with the use of said hall by any of the before mentioned organizations in the manner contemplated by this act.