"法院夏季休庭" can be translated into English as "court's summer recess" or "summer adjournment of the court".
"Recess" is commonly used in legal and official contexts to refer to a temporary break or suspension of proceedings, such as during a holiday period.
"Adjournment" also means the suspension or postponement of a meeting or session, and when combined with "summer," it clearly indicates the summer break period of the court.
Both expressions are accurate and commonly used in English to describe the situation where courts suspend their activities during the summer months.