noun
kindergarten playground open day
A program where a kindergarten opens its playground to local families with young children, often for free play and socializing.
来週の園庭開放に、近所の親子がたくさん来る予定です。
Many local parents and children are expected to come to the kindergarten playground open day next week.
園庭開放では、子どもたちが自由に遊べます。
At the kindergarten playground open day, children can play freely.
Compound of 園庭 (kindergarten playground/garden) and 開放 (opening to the public).