minstrel show

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A comic variety show of the 19th and early 20th centuries, usually featuring white actors in blackface.

Wiktionary

1. n. A variety show performed by white people in blackface.

WordNet 3.0

1. n. a variety show in which the performers are made up in blackface
2. n. a troupe of performers in blackface typically giving a comic program of negro songs and jokes