How do you know which day or period is "safe" to trade?

How do you know which day or period is "safe," meaning less market volatility or fewer news events? I do check the news, but I'm confused about how high-importance news sometimes has such a strong effect and weight that everything in the market seems to stop in anticipation of it. Yet, at other times, it doesn't seem to have as much effect, and the market only slows down slightly before the news event. I feel like even different types of high-importance news (such as CPI, Core CPI, Unemployment Claims, etc.) seem to have different weights, and I'm not sure how or where I can learn to differentiate them. I'm also curious about how to learn about economic and political news, and how to use it to my advantage. Is there any Discord server or channel where this is regularly discussed and explained?