Google “” critical mass route <today’s date.>"

How would a person who has no idea that it is called a critical mass event know to google when a critical mass event is held?

Is it really that hard to understand not everyone know what this is?

You have a very poor understanding of how these critical masses work, they do NOT function like normal protests, at least in the US.

Most critical masses of cyclists are intentionally made to be spontaneous, barely organized, and they do not give prior warning to locals (through the local media or such), the government, or even the police. The whole point of the intentional disorganization to escape the authorities when they eventually come in to restore order. The reason why they're called "critical masses" to begin with is because large turnouts is the only requirements of these events. There is no organization or leaders or hierarchy or anything to hold accountable.

So what happens is unsuspecting locals going on about their day get met with a mob of cyclists who are blocking traffic, ignoring any and all established safety laws, and disrupting the flow of the city. The people who do come across them don't know where they came from, where they're headed, or what they're going to do next.

That's why you can't "go around them" like you're suggesting. You're basically trapped in your car until they go away. These events put the cyclists in danger and they put the drivers in danger. That's why they're considered dangerous. If they functioned like how you imagined they functioned, then way less people would have an issue with them.

https://en.wikipedia.org/wiki/Critical_Mass_(cycling)