Thanks to folks at thisfinecrew for links, and links that led to other links among the following:
Solidarity Cville: Donate -- suggestions and links for local groups to support
Indivisble: Stand in Solidarity with Charlottesville - Find an Event
The Nation: Here’s What You Can Do After Charlottesville
Indivisible: Are Your Members of Congress Doing Enough to Respond to the Charlottesville Terrorist Attack? -- though this is several days old and therefore lacks a script for HOLY FUCK THE PRESIDENT IS DEFENDING NEO-NAZIS (EVEN MORE) WHAT ARE YOU GOING TO DO?
SPLC releases new edition of Ten Ways to Fight Hate guide after Charlottesville attack
Politico: GOP chairmen resist hearings on white supremacy
They don't want it. Demand it.
plaidadder: Three Democratic members of the House have introduced a censure resolution.
You can read the text here.
Censure is a formal reprimand. It is not legally binding, but it is rare, and Sends a Message. MoveOn.org originally organized around a campaign to get Congress to censure Clinton instead of impeaching him.
This may be an attempt to accomplish something less difficult than impeachment; or it may be a trial run to see how many Republicans are ready to jump from the Trump Train.
ETA: Politico: Pelosi endorses censure of Trump over Charlottesville response -- apparently at least 79 Democrats have signed.
Not directly Charlottesville-related, but interesting and could be worth asking your reps to support:
H.R.1987 - Oversight Commission on Presidential Capacity Act
To steal Wikipedia's explanation: "This bill would replace the Cabinet as the body that, together with the Vice President, determines whether Section 4 should be invoked. Under the bill, an eleven-member commission would conduct an examination of the President when directed to do so by a concurrent resolution of the Congress."
(Which, basically, shifts the power to forcibly 25th-Amendment the President back towards Congress to a greater degree, as opposed to depending entirely on the Cabinet which that President apppointed.)