The performance will feature the Manchester Survivors Choir, a group of people who were in attendance on the night of the bombing, and Parrs Wood High School's Harmony Group, whose post-attack tribute went viral past year and received praise from Grande herself. "I love you with all of me and am sending you all of the light and warmth I have to offer on this challenging day", she wrote along with a worker bee emoticon which is widely used to represent the city as a symbol of industry.
Ariana Grande will NEVER forget the tragedy that occurred during the Manchester Arena bombing.
One year on from the attack, Prime Minister Theresa May leaves a message on a "Tree of Hope" in Manchester.
In an interview with Time magazine last week, 24-year-old Grande spoke about her response to the attack and its impact on her music. She closed off the song by blowing a kiss and saying, "Happy birthday, Saffie".
Across Manchester, a 19th century industrial powerhouse turned diverse and creative modern city, residents made defiant statements of unity in the face of extremist violence.
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And thousands of members of the public have written messages of support on cardboard tags, attaching them to 28 "Trees of Hope" that form a trail from St Ann's Square to Victoria Station. "My heart is always going to be in Manchester", said Marr, "Always has been and always will be".
The Duke of Cambridge attended a remembrance service at Manchester Cathedral on Tuesday (May 22) commemorating the one-year anniversary of the attack.
Greater Manchester Mayor Andy Burnham said it was a day to "come together".
Later in the day, more than 3,000 singers from local choirs, including a group who were at the arena on the night, are expected to join forces at a "Manchester together" event in the city with half an hour of communal singing.
Prince William and Prime Minister were also in Manchester to visit with families of the victims.
He also told the crowd that the 22 candles lit in tribute to the victims at Manchester Cathedral had been made from the remnants of the hundreds left around the city in the aftermath of the attack. Prince William, second in line to the British throne, read a passage from the Bible. She said: "The people of Manchester are uniting to show they care, they are strong and that each and everyone of them are personally taking a stand in defiance". They performed an emotional version of Andra Day's Rise Up at the free concert. The event will include renditions of Grande's "One Last Time" and "Look Back In Anger" by Oasis, which became an unofficial anthem of Manchester after the bombing. An investigation into the attack continues, with about 100 investigators still working on the case, according to the police.