The HAIM sisters joined Dior in kicking off this year's Guggenheim International Gala on November 15th and 16th. The gala, which marked the 80th anniversary of the Solomon R. Guggenheim Foundation, honored artist Cai Guo-Qiang, former President of Guggenheim Board of Trustees Jennifer Blie Stockman and UBS in recognition of its collaboration with the museum…