If ads were merely about being informative, they would be boring. But ads want to manipulate, so they have to be flashy and appeal to your emotions.
They pollute your mental headspace, and have no place in a healthy society.
Let's ban billboards. And then let's follow that up with a general purpose ban on paid advertisement.
Essentially, to get the word out about your organization or product (whether for-profit or non-profit), you'd have to convince someone with an audience to feature you *without paying them to do it*. In other words, your organization or product or service has to be genuinely interesting on its own.
And, since nobody else is allowed to pay for people's attention, you aren't competing with budgets, you are competing with other ideas. Imho this makes for a much more interesting information landscape.
So, I do happen to have relevant experience. I haven't run a concert or a protest, but I've done the rest of the things you mentioned, some of which at considerable scale.
You continue to beg the question. "Without advertizing, companies would not be able to scale" is not a weakness of the push to ban advertizing - it is a virtue. The people advocating against advertizing _actively want_ businesses to have a smaller maximal size.