Dance Resources 

Dance journal databases are specialized - they're by authorities ("peer reviewed") and have special ways to get at art topics.

Magazine and Newspaper Indexes 

International Index to Performing Arts: Find dance reviews + criticism, as well as academic journal articles

ProQuest: Includes academic journals, magazine and newspaper articles

LexisNexis Academic: Search for additional newspaper/magazine articles on your topic

Academic OneFile: Search across magazine, journals, and books on your topic

JSTOR: Search for academic journal articles on your topics

MLA Bibliography - massive language-interests db, includes dance topics when related to theater

Frequently historic newspaper accounts can be primary sources for exhibitions and other reception documentation.  Also good for patronage verification and biographical/obituary accounts.  Both pdf scans of the actual column.

Times Digital Archive - the Times (London), 1785-1985

New York Times Digital Index - 1851 until three years ago.