We can use news calender to know and predict the price movement, especially the high impact news such as NFP, trade ballance and other high impact news.
we can see the example below :
News for NFP was red, and here the effect the news to the market
The price of GBP/USD after the news was released, move up significantly. then we know how news will impact the market.
to use news calender, we can see the color of each news. The yellow news is the news with low impact, the orange news have medium impact and the red one whcih have high impact to the market. then we can use red news to make analysis and use it in our trading