Seriously though, I respect the ideal of using HTML as much as possible for what it's made. But the web is more than just pure content sites. And Javascript provides a lot of nice things as well.
There are certainly web apps that could not function without JavaScript. This initiative is more of a protest to shoving functionally useless JavaScript down your throat when you browse a news site or read an article.
JavaScript should progressively enhance those types of websites, and not be a strict requirement.
The web is more than just pure content and, yes, some of it requires JavaScript to function. But it's a lot less than sites actually allow for. We shouldn't let perfect be the enemy of much, much better than the status quo.
I think they block everything for awareness. “Use a reasonable amount of JavaScript day” would not be very memorable. In actuality the right thing to do is leave JavaScript blocked by default, and then think critically about whether or not you trust a site enough to download and run a random program from it. If so, then JavaScript could be enabled.
Ah, haha, CSS naked day was actually first? I do have to admit that most of what I do on the web is consume content and there most JS like analytics and ads is useless to me. So I guess I might actually try NoScript for a day after all.
Seriously though, I respect the ideal of using HTML as much as possible for what it's made. But the web is more than just pure content sites. And Javascript provides a lot of nice things as well.