The main page for Transgender Unity Coalition is here.
Edit - MORE STATES seems like they are planning multiple state rallies so check em out if onenis around /E
I don't know much about the org, but this is when we need to organize gain community, build networks of allies and comrades. Most likely there will be liberals and those trapped in the 
there as well.
Thier donate button did NOT go to NGPvan or Actblue so I take that as sign of legit grassroots. Then again I need to see what they are doing. Going out of my way to be there in person is the only way to vulcan mind meld with them to find out and maybe spread some 
love.
They say it will be a rally rather than protest. So it is hopeful more productive rather than screaming into the void. Grassroots AROUND the party to sue and drag them kicking and screaming is how we got gay rights. Unfortunate it's come to this but we're going to have to do it with trans and nb rights as well.
