This menu is undated, and because it was for a group that evidently paid a fare that included meals, the meals are unpriced. An ebay dealer dates the menu to “c. 1915,” probably based on the clothing styles worn by the two people on the cover.
However, the Oregon Federation of Music Clubs was not formed until 1921, by which time these clothes were well out of style. In addition, four-color printing was rare in the 1910s, especially for something as ephemeral as a menu. I could be wrong, but I suspect the menu dates from no earlier than the 1930s and that the clothing styles (which look to me more 1890s than 1910s) are meant to evoke nostalgia.