If you are interested in Feminist/Activist art the Brooklyn Museum has a great website dedicated to it's Elizabeth A. Sackler Center for Feminist Art. You can explore various exhibitions, a Feminist Timeline, as well as various tags and categories you can explore such as global feminisms, mixed media and performance art.
The Elizabeth A. Sackler Center for Feminist Art is an exhibition and education environment dedicated to feminist art—its past, present, and future. Among the most ambitious, influential, and enduring artistic movements to emerge in the late twentieth century, feminist art has played a leading role in the art world over the last forty years. Dramatically expanding the definition of art to be more inclusive in all areas, from subject matter to media, feminist art reintroduced the articulation of socially relevant issues after an era of aesthetic "formalism," while pioneering the use of performance and audiovisual media within a fine art idiom. (x)
The Museum recently honored Yoko Ono for her contributions to the arts.
If you are looking to learn more about Feminist Art and the history of Feminism and Feminist Art, this is a wonderful resource!