We are having the graduation ceremony of boy's baseball team next week.
We are having the graduation ceremony of boy's baseball team next week.近い未来を話しているので、上記のように進行形を使った表現も出来ます。もちろん"We will have -"としてもオッケーです。be having a ceremony：卒団式が予定されているgraduation ceremony：卒業式
Next week, there is a graduation ceremony for the boy's baseball team.
「来週、少年野球団の卒団式がある」= Next week, there is a graduation ceremony for the boy's baseball team.「来週」= next week「少年野球団」= boy's baseball team「卒団式」= graduation ceremony
日本 
アメリカ合衆国 
