Passage: In March 2015, Kapoor spoke of his impending marriage to Mira Rajput, a student from New Delhi, who is 13 years his junior. The Times of India reported that Kapoor met Rajput through the Dharmic religious group Radha Soami Satsang Beas. The couple married at a private ceremony in Gurgaon on 7 July 2015, and Rajput gave birth to their daughter Misha in August 2016 and their son Zain in September 2018.In addition to acting in films, Kapoor performs on stage and hosts award ceremonies. In 2006, he participated in a world tour, entitled RockStars, in which he performed alongside Kareena Kapoor, John Abraham, Salman Khan and three other celebrities. From 2010–12, Kapoor has co-hosted three Screen Awards ceremonies with Shah Rukh Khan, and from 2012–14 he co-hosted three International Indian Film Academy Awards with either Khan or Farhan Akhtar.Kapoor practices vegetarianism, and credits the author Brian Hines' book Life is Fair for influencing this lifestyle choice. He also supports charitable organisations for various causes. In 2010, he took part in a charity event named Superstars Ka Jalwa, which helped generate money for the employees of the Cine and Television Artists Association (CINTAA). Also that year, he lent his support to the NGO Swayamsiddh, which helps children with special needs. The following year, he adopted three villages in support of NDTV's Greenathon, an initiative to support environmental consciousness and improve electricity supplies to rural areas. In 2012, Kapoor helped revive the Victory Arts Foundation NGO, founded by Shiamak Davar, which helps underprivileged children through dance therapy programs. Also that year, he appeared alongside other Bollywood celebrities in Because My World Is Not The Same, a short film by Zoya Akhtar, to generate awareness on breast cancer. He supports the People for the Ethical Treatment of Animals organisation through advertisement campaigns.

Question: When did Kapoor participate in the RockStars tour?
2006