1909

There was a protest on October 17th 1909 which fits the bill. Fermanagh Herald - Saturday 23 October 1909:

A demonstration organised by the British Social Democratic Federation, in co-operation with the Labour Party, Fabian Society, and other organisations, was held in Trafalgar Square, London, on Sunday afternoon, to protest against the execution of Senor Ferrer, and was attended by between nine thousand and ten thousand people.

John Spooner That's some crowd. Will the newspapers be our friend in uncovering Francisco Ferrer's alleged wrongdoing?

Date fairly securely established as 17 October 1909 then, thank you, and the postcard was sent on 10 September 1910.

Methinks the protest was a bit late.

en.wikipedia.org/wiki/Francisco_Ferrer

Francisco Ferrer was a Spanish radical freethinker, anarchist, and educationist behind a network of secular, private, libertarian schools in and around Barcelona. His execution, following a revolt in Barcelona, propelled Ferrer into martyrdom and grew an international movement of radicals and libertarians, who established schools in his model and promoted his schooling approach.

en.wikipedia.org/wiki/Francisco_Ferrer

The protest in Trafalgar Square was mild in comparison with what went on in Italy. It was "in the throes of a general strike" in protest against the "inquisitorial Spanish government", the Spanish consuls in Milan, Carrara and Florence resigned, and "immense bodies of soldiery" were guarding the Vatican day and night. (Daily Chronicle).,

It seems that the 'secular' aspect of Ferrer's teachings were seen as a threat to certain parts of the Spanish establishment.

This image has been used to illustrate Prader-Willi syndrome.
www.wikidata.org/wiki/Q594013
John Wilson Webb (1906-1938)
www.wikidata.org/wiki/Q125628404

We are in a 1909 tranche of images.

11 June 1909 was a Friday ...

Why does the central nun have a rose on her head?

beachcomber australia That's not a rose! That's a naughty behaviour detector!

the "naughty behaviour detector" is attached, as I squint, to the nurse apron behind, the expression of the woman with the book is priceless "my girls!!" intrigued also by the woman at centre front with the plaid apron - teacher or nurse. the sleeve covers are truly from a period past

Foxglove plaid apron also wears a "Votes for Women" button. EDIT I think the button could be from the Irish Women’s Franchise League (IWFL) which was started in 1908 by Margaret Cousins and Hanna Sheehy Skeffington.