[5] Australian pop rock band, 5 Seconds of Summer, served as the opening act for the European and North American dates.

[7] At the event, band member Louis Tomlinson described their upcoming album as being "rockier" and "edgier" than the music they have previously released.

[12] During an appearance on Good Morning America on 26 November 2013 to promote the release of their third album, the band announced 21 dates for the North American leg of the tour, with tickets going on sale on 7 December.

[14] In the midst of their tour, the band performed at BBC Radio 1's Big Weekend in Glasgow on 24 May 2014, and flew back to Dublin the same day for their second show at Croke Park that night.

[15][16] They also opened the second night of the iHeartRadio Music Festival on 20 September, at the MGM Grand Garden Arena in Las Vegas.