You don't need to sign up there or give any information, in fact, it's better if you don't. Just find the address, grab some snacks and water, a sign if you can make one, and show up.
If you have a printer, bring some union pamphlets to hand out and tell people about the General Strike. Spread the word if you can, share this image, and let's stand up together in solidarity and make some Good Trouble!