Other elements of current Olympic opening ceremonies were initiated later : the Olympic flame was first lit in 1928 , the first athletes ' oath was sworn at the 1920 Summer Olympics , and the first officials ' oath was taken at the 1972 Olympic Games .
Other elements of current Olympic opening ceremonies were started later : the Olympic flame was first lit in 1928 , the first athletes ' oath was sworn at the 1920 Summer Olympics , and the first officials ' oath was taken at the 1972 Olympic Games .