So far, I've only seen reporting from Breitbart and NBC bearing this out.
Democratic senators opened Kavanaugh confirmation hearing with a protest plan that was coordinated and agreed to over the weekend, people familiar with the planning tell @NBCPolitics.— NBC Politics (@NBCPolitics) September 4, 2018
Others major media outlets perhaps hope you'll overlook Democrat senators involvement.
This wasn't spontaneous or a grassroots uprising in protest. It was a carefully planned series of events made with participation and endorsement by some of the highest ranking people inside the Democratic Party.