Kelly Clarkson’s tours may have been cancelled for health reasons, but it certainly wasn’t cancelled for flagging ticket sales. Kelly held two concerts at Radio City Music Hall in New York that earned almost $1M. One night was sold out and the other was a near sell-out (tough to tell exact percentages with the flexible nature of venue sizes since a different number of tickets were available for sale each night (odd number of tickets). Some of that may be due to comping tickets to journalists and radio contests). Pentatonix from the Sing-Off was one of the openers.
Adam Lambert was in Brazil in mid-September in Concert + Queen and they sold-out both venues.
Kelly Clarkson, Pentatonix, Eric Hutchinson
July 16-17, 2015: New York, N.Y.: Radio City Music Hall: 11,143 of 11,581 (SOLD-OUT, ~92%): $992,105
Queen + Adam Lambert
Sept. 16, 2015: Sao Paulo, Brazil; Ginasio do Ibirapuera: 8,024 of 8,024 (SOLD-OUT): $730,990
Sept. 21, 2015: Porto Alegre, Brazil; Gigantinho: 4,882 of 4,882 (SOLD-OUT): $379,349