Yes. In fact, Chinese national holidays are unlike a lot of holidays in the West in that shops and attractions are busier and more open than ever! Many Chinese people travel on Chinese national holidays, especially during the long holidays of National Day and Chinese New Year. This makes those periods tricky to travel during for Westerners since many tourist attractions are packed with Chinese tourists. Also, prices for food and accommodation get a lot higher. So, it is strongly recommended NOT to travel during these times.