Sometimes our "Stop Loss" may not work well; can we still stick to this TS?

Some people strongly recommend that before very important news such as: NFP, BrExit referendum, FED Chair speech… we close our positions. Because it is possible that a huge gap in price occurs and our position may not be closed at Stop loss price and be closed at the first possible price and we lose all our money.
The “So Easy It’s Ridiculous” is a swing trading system and sometimes our positions should be opened several days. During these days maybe there is a lot of important news. If we close our positions before every important news, the trading system will not be profitable and if we don’t close, it is possible to lose all of our money. How can we know which news worth that we close our position even with negative profit?

If you’re trading a position that’s intended to be open for several days, then you likely shouldn’t be overly concerned with any individual news events. The one possible exception is when you’re near your stop as a major event comes up.