is 'not in this lifetime' a tour by them?
Yes, this tour was a concert tour by hard rock band Guns N' Roses,
Not in This Lifetime... Tour
Tour was a concert tour by hard rock band Guns N' Roses, 
who is playing drums for guns n roses Steven Adler is guns and roses a band? Yes, hard rock band Guns N' Roses who are the members? Axl Rose, Slash, Stradlin, Duff McKagan and Steven Adler.
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Not in This Lifetime... Tour [SEP] Introduction
The Not in This Lifetime... Tour was a concert tour by hard rock band Guns N' Roses, spanning from April 1, 2016 to November 2, 2019. It featured classic lineup members Axl Rose, Slash and Duff McKagan, marking the first time since the Use Your Illusion Tour in 1993 that the three performed together. After the previous tour in 2014, guitarists DJ Ashba & Ron "Bumblefoot" Thal, bassist Tommy Stinson and keyboardist Chris Pitman left Guns N' Roses, leaving the band with several open spots. Former members Slash and McKagan rejoined the band and Melissa Reese joined as keyboardist. The group embarked on the world tour that spanned several continents, with 175 shows performed to date.