In 2005, the United Nations General Assembly voted a resolution to establish the International Holocaust Remembrance Day on 27 January.
http://www.un.org/en/holocaustremembrance/docs/res607.shtml

In 2000, Italy had established by law the same day as Giorno della Memoria.
http://www.camera.it/parlam/leggi/00211l.htm

Trieste unfortunately was home to "the only example of a Nazi concentration camp in Italy": the "Risiera di San Sabba".
In 1965, a decree issued by the President of the Republic raised the “Risiera di San Sabba” to the status of National Monument.
As of 1975, the premises house a Museum.

“Risiera” is a former rice-husking facility that was built in 1898. After September 8, 1943, the Nazi occupation forces used the premises as prison camp, headquarters where deported prisoners were sorted out to be sent to Germany and Poland, raided goods depot, prison and extermination camp for hostages, partisans, political and Jewish prisoners. On April 4, 1944 a crematory plant was installed and made operative.
more on http://www.risierasansabba.it/english/

The Municipality is organizing several events this week to celebrate the Remembrance Day:
http://www.risierasansabba.it/wp-content/uploads/2016/01/GIORNO_MEMORIA_PIEGHEVOLE.pdf

The main official ceremony will take place on Wednesday, 27 January 2016 at 11:00 at Risiera di San Sabba, participation is of course open.

Quote from the message from Ms Irina Bokova, Director-General of UNESCO, on the occasion of the International Day of Commemoration in Memory of the Victims of the Holocaust, 27 January 2016

This spirit of remembrance, prevention and vigilance guides UNESCO in its Holocaust and genocide education programme, unique within the United Nations, through teacher training and the renewal of teaching methods, curricula and textbooks. Today, I call upon all Member States to participate in the effort to make this chapter of history better known in schools and media everywhere, as widely as possible. The exercise is complex, because studying genocide and its processes confronts us with the worst of humanity. It also enables us to discover the courage and foresight of those who were able to see the approaching storm and resist barbarity. In tribute to those men and women, and in memory of the victims, let us become the actors of active remembrance; remembrance that is turned towards the future and committed to the dignity of each and every human being, as a foundation for peace.