Simplify the following text for a Grade 3 native English-speaking person.
Original: Pi Day is celebrated on March 14 ( or 3\/14 in month\/day date format ) , since 3 , 1 and 4 are the three most significant digits of Ï in the decimal form . In 2009 , the United States House of Representatives supported the designation of Pi Day .
Simplified: Pi Day is held on March 14 .