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What is it?
It is a Solemn holy day of the Catholic Church.

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All Saint's Day is celebrated on November 1st.

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It is celebrated everywhere by Roman Catholic Church and some  denominations, and on the first Sunday after Pentecost in Eastern Orthodox churches. It is celebrated in the french country Ivory Coast.

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It is celebrated for all those who have entered heaven.

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On All Saint's Day everyone is required to go to mass but some countries may waive the requirement. People leave offerings like flowers and light candles when they visit the graves of the deceased relatives.

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it is known that churches were already celebrating All Saints on 1 November at the beginning of the 8th century to coincide with or replace the Celtic festival of Samhain.