After the march, foot-wide (0.30 m) sections of the flag were given to individual sponsors after the event had ended. Additional large sections of the flag were sent with activists and used in pride parades and LGBTQ marches worldwide. One large section was later taken to Shanghai Pride in 2014 by a small contingent of San Francisco Sisters of Perpetual Indulgence, and documented in the film Stilettos for Shanghai.
I wonder what they did with it after.
https://en.wikipedia.org/wiki/Rainbow_flag_(LGBTQ)#Mile-long_flags