Ah ok, same as the USA. No trades settle today, but the markets are open.
Just to be pedantic: in the UK, Remembrance is an occasion for solemnity rather than celebration (so no public holiday, and yes, buying a poppy to raise funds for the British Legion is such a thing that from late October onwards it is de rigueur, particularly for any celebrity appearing on TV, certainly the BBC).
The official public ceremonies were moved to the Sunday before during WW2 and it was decided to stick to the second Sunday in November thereafter, but relatively recently it’s again become unofficially usual for the two minutes’ silence to be observed in public spaces on the 11th itself as well.
In Canada this solemn remembrance uses a minute of silence. The poppy is essentially required and the occasional workplace that does not allow them gets crucified in the papers.
Something I’ve only recently learned is that, in Great Britain and some other European countries (and in Canada, it appears), November 11th is Remembrance Day, and it is, as you note, a solemn commemoration of those who died during war or other military service.
In the U.S., that sort of commemoration is observed on Memorial Day (the last Monday in May); November 11th is Veterans Day here, and is a day to honor all military veterans, living and dead.
And the point @Lord_Feldon makes is actually applicable to Remembrance Day in Canada; it’s typically grey and overcast, often with snow - fits the character of remembering particularly the soldiers of WWI, surviving in their trenches. (I know that Canada has since lost soldiers in warmer climes, but for me, Remembrance Day is closely tied to the Great War, as the start of the wars to end all wars.)