Conversation so far:
How was the musician Usher interested in art and feminism?
In December 2014, the musician Usher attended and participated in an art installation at JJ Brine's VECTOR Gallery at Select Fair by performance artist Lena Marquise Body As Commodity.

Question: How did he participate?
Self-contained rewrite: How did the musician Usher participate in the art installation at JJ Brine's VECTOR Gallery at Select Fair by performance artist Lena Marquise Body As Commodity?