cān jiā qìng zhù huó dòng

attend a celebration

The Chinese phrase '参加庆祝活动' means to take part in or be present at a celebration or festive event. This usage is common in social contexts where people gather to honor or celebrate special occasions such as birthdays, weddings, or holidays. It emphasizes the act of joining others in the festivities, and can be used in both formal and informal situations.