입학식이 · 입학식을
entrance ceremony, school opening ceremony
Example
3월 초에 초등학교 입학식이 있어요.
The elementary school entrance ceremony is in early March.
Word parts
입 enter+학 school+식 ceremony
-식 = ceremony: 입학식, 졸업식, 결혼식.
Good to know
Pronounced [이팍씩]; Korean school years start in March, so entrance ceremonies are held then.