Indeed today is that special day when we are meant to stop albeit a few minutes and reflect on this immense human tragedy:
In 1977, the General Assembly called for the annual observance of 29 November as the International Day of Solidarity with the Palestinian People (resolution 32/40 B). On that day, in 1947, the Assembly adopted the resolution on the partition of Palestine (resolution 181 (II)). - Full text
More here
Related Activities (that I know of)
On this day, in Great Britain, activists will be lobbying Parliament to "Stop Starving the Palestinians - Stop Arming Israel".
A senior PLO aide is in New York to participate in the event at the UN.
And as my contribution to this day's event, I offer this article: Peace through equality for all and this video: Visit Palestine.