Well-wishers have also been encouraged to share messages of tribute, solidarity and love, and hang them on the Trees of Hope trail throughout the city, the Manchester Evening News reported.
Grande, who had just finished performing when the bomber struck outside, also shared a message of support for those affected.
"It was created to strike at the heart of our values and our way of life in one of our most vibrant cities, with the aim of breaking our resolve and dividing us".
Tweeting alongside the clip, she wrote: "so wish i were there with u all today. u have no idea. love you so v much".
An estimated 3,000 singers were thought to be at the open-air Manchester Together - With One Voice event to perform songs by some of the city's most successful bands.
Up to 15,000 people packed into Manchester's Albert Square on Tuesday night as the city marked the first anniversary of the terror attack which killed 22 people.
"Seeing how everyone reacted made me so proud to be a Mancunian". "It will also give thanks to emergency workers who assisted on the ground and in the aftermath of the attack".
Some laid bouquets of flowers in St. Ann's Square.
Among the dignitaries present were the Duke of Cambridge, Prime Minister Theresa May, Labour Party leader Jeremy Corbyn, First Minister of Scotland Nicola Sturgeon, Lib Dem leader Sir Vince Cable, Greater Manchester Chief Constable Ian Hopkins, Greater Manchester Mayor Andy Burnham and Sir Richard Leese, the leader of Manchester City Council.
Bells were scheduled to ring out from the town hall at 10.31pm, marking the moment the attack took place.