This is last minute, but I just found this announcement and PBS is providing live coverage tomorrow (Wednesday 7 ET). [see link in next paragraph]
PBS and several other news outlets have announced today that members of the Senate Commerce Committee will take testimony from the CEOs of Twitter, Facebook, and Google. Committee members of the two parties have very different interests. Republican members feel that conservative content does not receive equal coverage (despite the fact the companies do not produce content) and are particularly upset Twitter and Facebook have blocked direct access to the unsubstantiated New York Post story regarding Biden and the Ukraine. Democrats have concerns more related to the collection of personal information and monopolistic tendencies. Obviously, the Republican issue is more time sensitive and they would like their concerns promoted before the election.
This article from SFGate offers more political commentary.