adman, advertiser, advertizer - someone whose business is advertising

barker - someone who stands in front of a show (as at a carnival) and gives a loud colorful sales talk to potential customers

booker, booking agent - someone who engages a person or company for performances

exhibitioner, exhibitor, shower - someone who organizes an exhibit for others to see

organ-grinder - a street musician who plays a hand organ or hurdy-gurdy

porn merchant, pornographer - someone who presents shows or sells writing or pictures that are sexually explicit in violation of the community mores

Barnum, P. T. Barnum, Phineas Taylor Barnum - United States showman who popularized the circus (1810-1891)

Buffalo Bill, Buffalo Bill Cody, Cody, William F. Cody, William Frederick Cody - United States showman famous for his Wild West Show (1846-1917)

Diaghilev, Sergei Diaghilev, Sergei Pavlovich Diaghilev - Russian ballet impresario who founded the Russian ballet and later introduced it to the West (1872-1929)

D'Oyly Carte, Richard D'Oyly Carte - English impresario who brought Gilbert and Sullivan together and produced many of their operettas in London (1844-1901)

Hurok, Sol Hurok, Solomon Hurok - United States impresario who was born in Russia (1888-1974)

Charles Ringling, Ringling - United States showman whose song-and-dance troop evolved into a circus (1863-1926)