The festival was a peaceful one, being inside the city the event required attendees to rely on external accommodation - unlike more popular festivals such as Download Festival or Reading and Leeds Festival, which require camping on site for most people.
Despite the veteran status of the headline acts, most other bands were younger and with a more 'contemporary' audience, providing a contrast in musical styles. Since this festival, Razorlight particularly has acquired much fame and in under a year has gone from second slot in a smaller inaugural event like Hyde Park Calling to headlining the long-running and respected Reading/Leeds Festival. The festival mainstage proved to be unusually British, with the British Isles being represented by seven English bands and two Scottish, with only one American and one New Zealand band from abroad. However of the ten second stage bands, three were from Canada and two from the USA.
After Hyde Park Calling's success, a Hyde Park Calling 2007 quickly entered planning stages. It was announced that the event would take place during the weekend of 23–24 June 2007. It was Aerosmith's first concert in the United Kingdom for 8 years, and featured Peter Gabriel and the recently reformed Crowded House as a joint-headliner for the first day. Other draws to this year's event were the addition of a new third stage. Only one band to have played at the previous Hyde Park Calling, Rose Hill Drive, played again in 2007. With six bands per stage instead of five, and an extra stage, the expansion of the festival only a year after its inception was dramatic.
Sunday became an "Aerosmith Family" event. Aerosmith headlined the mainstage, with it opened by The Micki Free Electric Blues then Arckid - a band featuring Steve Tyler (vocalist of Aerosmith)'s son in law. Chris Cornell played the main stage before Aerosmith made their appearance. TAB the Band, played fourth on the bill on second stage featuring Aerosmith guitarist Joe Perry's two sons. Many people saw the event as unbalanced, with most commercially successful bands playing the Sunday (Aerosmith in particular - having sold more albums than both of Saturday's headline bands combined). The second stage was sponsored by Pepsi.
Despite Aerosmith having the headline slot on Sunday, Chris Cornell played for the same length of time. His set combined Audioslave and Soundgarden songs with his own. In keeping with the family theme Aerosmith brought with them, on Saturday Peter Gabriel's daughter sang and played percussion. On Sunday Cornell brought his two children onto the stage for the audience to see.
Aerosmith had to finish at 10.30 pm due to the curfew, and the police were forcing them to leave. The encore was the usual Walk this Way song, but featured Darryl McDaniels (commonly referred to simply as 'DMC'). This was the first time a member of Run-D.M.C. had performed with Aerosmith since their 2002 tour, five years previous.
In 2009, for the first time it was a three-day event, beginning on the Friday rather than a Saturday, running over 26, 27 and 28 June. Neil Young headlined on Saturday and his encore was a cover version of "A Day in the Life" by the Beatles. Paul McCartney joined him on stage for parts of this performance. Bruce Springsteen finished his headlining set with "Dancing in the Dark", while he also joined The Gaslight Anthem for their song "The '59 Sound". Springsteen's entire set was released on DVD in June 2010, titled London Calling: Live in Hyde Park.