During the following tour, the band headlined the Monsters of Rock festival at Donington Park for the first time on 20 August 1988, playing to the largest crowd in the festival's history, with an estimated 107,000 in attendance. Also included on the bill were Kiss, David Lee Roth, Megadeth, Guns N' Roses, and Helloween. The festival was marred, however, by the deaths of two fans in a crowd-surge during the aforementioned Guns N' Roses performance; the following year's festival was cancelled as a result. The tour concluded with several headline shows in the UK in November and December 1988, with the concerts at the NEC Arena, Birmingham recorded for a live video, entitled "Maiden England". Throughout the tour, Harris' bass technician, Michael Kenney, provided live keyboards. Kenney has acted as the band's live keyboard player ever since, also performing on the band's four following albums before Harris took over as the group's sole studio keyboardist from 2000's "Brave New World".