A cathedral service, a minute's silence and a sing - along vigil will 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 an Ariana Grande concert on 22 May 2017.
Grande tweeted on Tuesday morning to say she was "thinking of you all today and every day".
The national minute's silence will start at 14:30 BST.
Prime Minister Theresa May and Prince William will attend the memorial service at Manchester Cathedral at 2pm.
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. "
Source: BBC News
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