The names of those who lost their lives in the September 11th terror attacks in 2001 as well as those who died in the 1993 attack will be read by family members, at the site of the World trade Center.
There will be pauses for six moments which mark the timeline of the 9/11 attacks which left 2,998 dead.
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Ex-Spitfire pilot Allan Scott, 94, said he was told off by the Queen when he first met her in 1943 when she was just 16.
Last minute preparations are going on at the Church of St Mary Magdalene where Princess Charlotte will be christened.
Princess Charlotte is being christened on Sunday at Sandringham in Norfolk in only her second public appearance since she was born.