August 1920 advertisment for "Moonlight Cruises De Luxe" on the Steamer Sidney at New Orleans. Artwork shows the riverboat, an African-American band, and a white couple dancing.  Ad lists times and prices, and "the South's greatest 10 piece orchestra."  (This was the Fate Marable band, which included many noted black New Orleans jazz musicians of the era, including at the time young Louis Armstrong; a somewhat later version of the band recorded 2 sides for Okeh Records in 1924 as "Fate Marable's Society Syncopators". )
Unnamed advertising authors
August 1920 advertisement in New Orleans newspaper (the Times-Picayune, New Orleans Item, Daily States; that merged into current Times-Picayune; which not specified by intermediate source) via <a rel="nofollow" class="external autonumber" href="http://www.nola.com/entertainment/index.ssf/2016/08/reporter_surprised_to_find_jaz.html">[1]</a>