Mark Twain and company depart Sault Ste Marie aboard the steamship F.S. Faxton and travel to Mackinac Island. He speaks that night at the Grand Hotel. 

Eccentricities of Genius 202-4  

https://en.wikipedia.org/wiki/Grand_Hotel_(Mackinac_Island)  

"Grand Hotel MI From Lake" by Dehk - Own work. Licensed under CC BY 3.0 via Wikimedia Commons - https://commons.wikimedia.org/wiki/File:Grand_Hotel_MI_From_Lake.jpg#/media/File:Grand_Hotel_MI_From_Lake.jpg