“Challenging times” have forced Sonisphere Music Festival organizers to cancel the event, and with it the highly-anticipated Adam Lambert and Queen reunion.

Event organizers have promised a full refund to ticket holders and apologized to festival fans in a statement explaining the cancellation.

Putting the festival together in what is proving to be a very challenging year was more difficult than we anticipated, and we have spent the last few months fighting hard to keep Sonisphere in the calendar.

Unfortunately circumstances have dictated that we would be unable to run the festival to a standard that both the artists and that Sonisphere’s audience would rightly expect.

Queen released a statement expressing the band’s disappointment at the cancellation.

“We are disappointed to hear of the cancellation of the Sonisphere Festivals as we were very much looking forward to performing with Adam Lambert and particularly as the venue was Knebworth, our last stand with Freddie. We apologise for the disappointment to all those who were looking forward to seeing us. We are working to see if we can redress the situation at some other venue.”

Kiss, Marilyn Manson, Evanescence, Incubus and more were to perform at the Sonisphere event in Knebworth, U.K. in July.

Russian fans will still have the chance to see the Glambert-Queen reunion in Moscow on June 30, according to the Hollywood Reporter.