Attendees of Europe's biggest street party have been asked to wear green clothing to show their respect for the victims of the tragedy.
At Ladbroke Grove, near the site of the tragedy, there is a "silent zone for reflection" for those who want to stop and pay their respects. Musicians and floats will lower their music as they pass by.
The carnival began with a multi-faith prayer, a release of doves and a rendition of Bridge Over Troubled Water.
London Mayor Sadiq Khan also met with families of victims of the fire.
Hundreds of thousands of carnival-goers are expected to mark a minute's silence at 3pm on both Sunday and Monday.
A widely shared message highlighting the plans encouraged attendees to "come in the spirit of peace to respect and remember our lost friends and family."
Pepe Francis, chairman of the carnival trust, told the BBC: "This will be the first opportunity for visitors to carnival to pay their respects for those affected by Grenfell."
Volunteer Toby Laurent Belson added: "Green is a beautiful colour, of healing, of growth, and strength in adversity."
Carefully crafted decorations such as paper hearts and banners will "remind people of what's happened and show solidarity," he added.
Mr Benson works at a donation centre for victims of the fire.
Only residents will be allowed to go close to the remains of Grenfell Tower, which locals told LBC is part of an effort to stop "grief tourists" from going there to take pictures and selfies.
The June blaze killed at least 80 people. Many of the dead have yet to be identified.
Other events marking the disaster and calling for justice for its victims have been held across London over the past two months. These include a monthly silent march by the Justice 4 Grenfell campaign group.
Join our commenting forum
Join thought-provoking conversations, follow other Independent readers and see their replies