 Complete the following phrase:  Following Bonos recuperation, U2 embarked on the Innocence  Experience Tour in May 2015, visiting arenas in North America and Europe from May through December. The group structured their concerts around a loose autobiographical narrative of innocence passing into experience, with a fixed set of songs for the first half of each show and a varying second half, separated by an intermissiona first for U2 concerts. The stage spanned the length of the venue floor and comprised three sections: a rectangular main stage, a smaller circular B-stage, and a connecting walkway. The centerpiece of the set was a double-sided video screen that featured an interior catwalk, allowing the band members to perform amidst the video projections. U2s sound system was moved to the venue ceilings and arranged in an oval array, in hopes of improving acoustics by evenly distributing sound throughout the arena. In total, the tour grossed US152.2 million from 1.29 million tickets sold. The final date of the tour, one of two Paris shows rescheduled due to the 