April Fools Day

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A′pril Fools'′ Day`

April 1, when jokes or tricks are traditionally played on the unsuspecting.
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References in periodicals archive ?
April Fools Day or All Fools Day, although not a holiday in its own right, is a notable day celebrated in many countries on April 1.
All Fools Day.Disappointed, Norris Green (name and address supplied)
LIGHT-HEARTED music will feature in an All Fools Day concert in Rugby.