This is the 5843rd most frequent Chinese word.
国庆
National Day.
In this sentence, '国庆节' refers to the specific holiday celebrated annually as China's National Day.
国庆节是每年十月一日，中国的全民庆祝日。
National Day is October 1st every year and is a nationwide celebration day in China.
Here, '国庆' is used as shorthand for the National Day period, referring to the holiday associated with the celebration.
我们打算在国庆期间去旅游好多地方。
We plan to travel to many places during the National Day holiday.
In this example, '国庆' denotes the specific day, October 1st, when the celebrations occur.