An Edwardian women's party in Finsbury Park

I'd saved this photo some time ago with the the following parenthetical addition to the file name - "(No idea what's happening here)" ... and I still don't.

Could it be just as I'd written in the file name: does it simply show an Edwardian women's day out? Were they a group of local middle class ladies from one of the ladies' societies that had been flourishing since the 1890s? Servants? Suffragists?