To promote "Rainbow", Kesha embarked on the Rainbow Tour (2017–2019), which began on September 26, 2017, in Birmingham, Alabama, and visited North America, Europe, Oceania, and Asia. She furthered promotion by joining a co-headlining concert tour with American rapper Macklemore named The Adventures of Kesha and Macklemore (2018). This tour took place in North America between June 6, 2018 and August 5, 2018. Kesha's documentary film, "Rainbow: The Film", was released on Apple Music on August 10, 2018. The documentary chronicles her stint in rehab for her eating disorder and the creation of "Rainbow". In the same month, Kesha collaborated with British rock band The Struts on the remix of their song "Body Talks", released as a single from their album "Young &amp; Dangerous" (2018). On September 19, 2018, Kesha released her song "Here Comes the Change", which served as a single to promote "On the Basis of Sex" (2018), a biographical film about Ruth Bader Ginsburg. In October 2018, Kesha collaborated, wrote, and performed on the song "Safe" with her younger brother Sage Sebert and rapper Chika, as an homage for the Parkland, Florida school shooting.