Katy Perry's One Love Manchester outfit featured pictures of the victims of the arena attack
Sunday evening was a memorable and emotional one for those in attendance at Old Trafford Cricket Ground.
Although the sight of people enjoying themselves at One Love Manchester was a welcome one after the recent terror attack on the city, thoughts of the 22 that lost their lives that night were never far away.
Katy Perry was one of a number of world-famous artists to take to the stage, but it seems many people watching the event missed the significance of her specially-designed outfit for the evening.
As pointed out by Yahoo, the 32-year-old, who performed hits Part of Me and Roar during the concert, wore a printed turtle neck which featured the pictures of the victims of the attack.
The event was organised by Ariana Grande, whose concert in the city on May 22 was targeted by a suicide bomber.
After she closed Sunday night's show with a haunting rendition of Somewhere Over The Rainbow, there have been calls for the 23-year-old to be granted the freedom of the city on social media. A petition has also been set up asking for her to be honoured in this way.
'Ariana Grande has inspired people up and down the country with her selfless acts of kindness,' the petition's creator, Matthew Duggan, explained.
'She didn't need to return to Manchester but tonight she did and brought the nation to tears and for that I feel she should be granted Freedom of the City of Manchester.'