I think it's a case to case basis depending on how much influence that event has to the place it is in and the organizer of it. Imagine if someone just organized an event to spread the information about Bitcoin, and he tries to market it, but only a few people come. When someone like Binance hosts an event, it's quite easy for them to spread the news about it, and they are one of the biggest exchanges there could be impactful results.
So when Facebook and alike tend to lean towards the cryptocurrency space, it's going to be influential, like the Libra you mentioned.
You cannot separate what the world is doing and how it's affecting cryptocurrencies; it's not independent of anything.
It's unfortunate to see how closely crypto is linked towards mainstream events, as it was designed to be free from middleman. In order for crypto to work as intended, it needs to become independent from what happens in the mainstream world. Only then, it can be used as a "safe haven" against the traditional monetary system of today. With a closer look at the crypto market, I was able to determine that crypto behaves similar to the traditional stock market. Positive news in the mainstream world influence crypto's price across the market, whereas negative news does otherwise. Considering that most people are into crypto for the money instead of believing in its potential to decentralize finance, the market has reacted in strange and bizarre ways at times.
I'd be surprised to see the impact of crypto's price on the market with the decision of worldwide governments to ban their use in their entirety. While crypto is still decentralized, the mere fact that it'll be declared "illegal" would negatively impact its price across the market. Of course, I don't expect this to happen anytime soon. But if it does, you'll realize that crypto moves accordingly to events happening in the mainstream world.
Nonetheless, I hope that crypto becomes more independent as decentralized solutions (DEXs, atomic swaps, etc.) become widely adopted by people in the mainstream world. Only then, mainstream events won't have an impact (either positive or negative) over crypto's price. But the mere fact that centralized exchanges dominate the space, explains why so many events in the mainstream world are directly linked to crypto's price on the market. Just my opinion