The holiday is long and the internal market is closed. However, the external market did not affect the normal opening. Once the external market fluctuates violently, the stock market is fine, but the reaction of the futures market will be more intense, and there will often be unilateral ups and downs. Even in extreme market conditions (up and down at the opening), customers can easily exceed the risk level and be forced to close their positions by the exchange (even unable to close their positions and owe positions).