Grohl and the Foo Fighters sometimes perform as a cover band "Chevy Metal", as they did in May 2015 at "Conejo Valley Days", a county fair in Thousand Oaks, California.
On June 12, 2015, while playing a show in Gothenburg, Sweden, Grohl fell off the stage, breaking his leg. He left temporarily and returned with a cast to finish the concert. Afterward, the band cancelled the remainder of its European tour. To avoid having to cancel the band's upcoming North American tour, Grohl designed a large "elevated throne" which would allow him to perform on stage with a broken leg. The throne was unveiled at a concert on July 4, where Grohl used the stage's video screens to show the crowd video of him falling from the stage in Gothenburg as well as X-rays of his broken leg. Beginning with the show on July 4, the Foo Fighters began selling new tour merchandise rebranding the band's North American tour as the Broken Leg Tour. Grohl later lent his throne to Axl Rose of Guns N' Roses after Rose suffered a similar injury on April 1, 2016, the band's first show with Slash and Duff McKagan in nearly 20 years.
On July 31, 2015, Grohl posted a personal reply to Fabio Zaffagnini, Marco Sabiu, and the 1,000 participants of the "Rockin' 1000" project in Cesena, Italy, thanking them for their combined performance of the Foo Fighters' song "Learn to Fly" from their 1999 album There Is Nothing Left to Lose, indicating (in broken Italian), "... I promise [the Foo Fighters will] see you soon". On November 3, the Foo Fighters performed in Cesena, where Dave invited some "Rockin' 1000" members onto the stage to perform with the band.
On May 20, 2015, David Letterman selected Grohl and the Foo Fighters to play "Everlong" as the last musical guest on the final episode of Late Show with David Letterman. Letterman stated that he considered "Everlong" to be his favorite song and that he and the band were "joined at the hip" ever since the band canceled tour dates to play his first show back from heart bypass surgery at his request.
On December 1, 2015 Grohl appeared on an episode of The Muppets where he competed in a "drum off" with Animal.