Ariana Grande has tweeted “thinking of you all” ahead of a day of remembrance to mark the first anniversary of the Manchester Arena attack.
Twenty-two people were killed and hundreds injured when Salman Abedi detonated a bomb at the end of one of her concerts on 22 May 2017.
Events include a service at Manchester Cathedral at 14:00 BST and a sing-along vigil.
There will also be a national minute’s silence at 14:30.
Grande, who staged the One Love concert in Manchester less than two weeks after the attack, said on Twitter: “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.”
Greater Manchester mayor Andy Burnham has tweeted his support for everyone affected by the explosion.
He said: “Today we come together, we remember each of the 22 people whose lives were taken.”
As the day unfolds people involved on the night have been giving their reaction to the anniversary.
Dan Smith, the second paramedic to arrive at the scene of the attack, said it was going to be a “difficult day”, adding: “This date will never be the same again.”
He said he got on with his job on the night of the attack and only realised the impact of the “massive attack” when he went home and saw it on TV.
Mr Smith he did not want to dwell on the “devastation” or know anything about the man responsible for the attack, but focus on the “positives” from that night of how many lives were saved and the amazing response from the Manchester community and beyond.
People have been using social media to remember and mark the day.
Laura said on Twitter: “This time last year I couldn’t sleep because I had just bought tickets for Ariana and booked my hotel in Manchester. Tonight, I can’t sleep because of the memories.”
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Who will be at the memorial service?
Prime Minister Theresa May and Prince William will join families of victims and emergency workers who went to their aid.
Only those with invitations can attend, but people will be able to watch the service on a big screen in the nearby cathedral gardens, and further afield at York Minster, Liverpool Metropolitan Cathedral and Glasgow Cathedral.
Capturing city’s spirit in song
The Manchester Together With One Voice event takes place between 19:00 and 21:00 and will bring together choirs from the city and beyond.
The final half hour will be a sing-along broadcast live on BBC Radio Manchester.
Families of the 22 people killed were invited to select lyrics, and members of the public were asked to make suggestions online.
Manchester City Council leader Sir Richard Leese said music was “in Manchester’s soul”, as was shown in the aftermath of the attack when “spontaneous song captured the city’s spirit”.
A crowd sang Don’t Look Back In Anger by Oasis at a vigil following the attack.
He said: “Coming together in song will once again demonstrate that remarkable sense of togetherness.”
Bells will toll in tribute
At 22:31 bells across the city centre will ring out to mark the moment of the explosion.
Bells at Manchester Town Hall, St Ann’s Church and St Mary’s Roman Catholic Church will sound in tribute to the victims.
Shining a light on city square
A further event, named There Is A Light, will run between Tuesday and Saturday with song lyrics projected on to St Ann’s Church and other parts of St Ann’s Square.
St Ann’s Square became a focal point for tributes in the wake of the bombing, with many thousands of wreaths left by well-wishers.
Some of the flowers were later composted and the soil used for the Trees of Hope Trail, where trees were planted around the city centre.
Members of the public can write messages on special tags to be attached to the Japanese maple trees until Tuesday evening.
How can people watch the events?
13:45 BST to 15:15 BST: Special coverage of the National Service of Commemoration, on the first anniversary of the Manchester Arena attack, including a minute’s silence at 14:30 BST.
19:00 BST to 21:00 BST: Special coverage of the “Manchester Together” commemoration event.