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!
I was down to keep going with that no kings thing. I wonder how much merchandise corporations will be selling next year for no Kings Day. Do you think target will have a T-shirt? ;-)
It's been a new name for each one, I guess to appeal to different groups for different problems. The 'Hands Off!' one for stopping the dismantling of Social Security did succeed in getting massive attendance from older people, so it seems to be working.