Prerequisites: Laptop with wifi, modern browser, text editor
It is a powerful, simple, infuriating, elegant and sometimes irrational programming language which was born in a hurry and can now do almost anything you can imagine. It can make whizzy websites, speak to databases, and draw maps, it can fly drones, make games, and build apps. You can run it on your watch or on your phone, on any web page or on hundreds of virtual servers.
And if you're reading this you're probably contemplating learning it.
You'll need to come equipped with a laptop, and you should have a modern browser installed, along with a text editor you're comfortable using. You don't need to have a lot of knowledge or experience to join in, though any familiarity with another programming language will help a lot.