Simplify the following text for a Grade 3 native English-speaking person.
Original: This day , now known as Inauguration Day , was on March 4 from 1793 until 1933 . Since then , Inauguration Day has occurred on January 20 ( the 1933 ratification of the Twentieth Amendment changed the start date of the term ) .
Simplified: Up until 1933 , this day was March 4 , but now it is January 20 .