The School Open Day The First Day of School

Today is the open day of my son's school my son's first day of school. We parents listened to the teacher class with the children, and we all played games together. All of us were very happy. Thanks I am/we are thankful/grateful for the teacher's hard working in this semester.

The School Open Day

Today is was the open day of/at my son's school. We parents listened to observed/looked on in the class together with the children, and played games together, all of us were very happy. Thanks for teacher's hard working in this semester.