Rare Ticket of Houdini's 18 October 1926 Performance

18 October 1926 Pricess Theater of Montreal ticket. Houdini lectured on spiritualism at McGill University and on 22 October Houdini was attacked with punches in his stomach. Days later he was hospitalized and Passed on halloween, 1926. Lovecraft (according to L Sprague de Camp's biography) was invited to Detroit shortly after the Montreal engagement, but he declined. Is this declined invitation one more clue that HPL was being recruited in Houdini's growing battle against Spiritualists?