A couple of weeks back i had a group of 10 people staying through the aribnb from an NGO that organises the celebrations for the 17th of November, on the internet this public holiday is written as the "Struggle for Freedom and Democracy Day." They hold the event at Národní Třída. link here
On the 17th of November 1939, nine Czech students were Executed by Nazi forces that occupied the then Czechoslovakia. Link here The 9th of November is also International Students' Day.
The group were positive, full of energy and enthusiasm for Czech and its future. Was kind of refreshing to see this.