occurred. Plans for stadium shows were first mentioned by Iredale in March 1992, but not confirmed until the 23 April announcement of the "Outside Broadcast" leg in North America. It was accompanied by details of two concerts, for which tickets went on sale two days later. While U2 were motivated to play stadiums by pragmatic concerns, they saw it as an artistic challenge as well, imagining what artists Salvador Dalí or Andy Warhol would have done with such spaces. Rehearsals for "Outside Broadcast" began in Hersheypark Stadium in Hershey, Pennsylvania, on 2 August 1992. To accommodate fans who had been camping outside the venue to listen, the band held a public dress rehearsal concert on 7 August, with half-price tickets benefiting five local charities. Technical problems and pacing issues forced refinement to the show. On 5 August, six days before the official leg-opening concert at Giants Stadium, the group delayed the show by a day, due to the difficulty of assembling the large outdoor production. By the time "Outside Broadcast" began, Achtung Baby had sold four million copies in the US. The "Zooropa" leg was announced in late November 1992, and tickets for the British concerts were put on sale on 28 November. The leg, which began in May 1993, was U2's first full stadium tour of Europe and marked the first time they had visited certain areas. For the "Zoomerang" leg, the band faced difficulties with booking concerts in Sydney, Australia, where they wanted to stage a worldwide television broadcast to end the tour. In early August 1993, after the Sydney Cricket Ground Trust rejected the band's application to perform at the Sydney Football Stadium in November, Bono publicly questioned the city's viability as a candidate to host the 2000 Summer Olympics; the trust's decision was made despite allowing concerts by Madonna and Michael Jackson to be held at Sydney Cricket Ground in November. McGuinness faxed all 29 members of the Sydney Olympics 2000 Bid Committee to inform them of the situation. John Fahey, the Premier of New South Wales, personally intervened to allow the Sydney concerts to take place, and an announcement was made on 15 August confirming them. Tickets for the Sydney and Melbourne shows went on sale on 23 August. Scheduling for the "Zoomerang" leg afforded the band more off-days between shows than previous legs, but this amplified the exhaustion and restlessness that had set in