From all poor old DonDiego reads it is essentially a "Girl's Weekend Out", comprising use of foul language and hints of assassination/revolution.
The result should be thousands of exhausted women quite satisfied with their display of solidarity and power, . . . yielding, . . . umm, . . . nothing in particular.
Oh, and somebody made a $bundle$ selling "pussyhats" to the protestors. Pr'bly some entrepreneurial guy.
Ref: Daily Mail
From the protest=parking-lot: