Question: National Survivors of Suicide Day was designated by which organization, as a day when the friends and family of those who have died by suicide can join together for healing and support, it's day always falls on the Saturday before Thanksgiving, a national holiday celebrated in Canada, the United States, some of the Caribbean islands, and Liberia?

Context paragraphs:
National Cancer Survivors Day: The National Cancer Survivors Day is a secular holiday celebrated on the first Sunday in June primarily in the United States of America.  The day is meant to “demonstrate that life after a cancer diagnosis can be a reality”.  Though it is mainly celebrated in the United States, the National Cancer Survivors Day Foundation is attempting to grow its popularity in other countries, with some success.

Thanksgiving (United States): Thanksgiving, or Thanksgiving Day, is a public holiday celebrated on the fourth Thursday of November in the United States.  It originated as a harvest festival.  Thanksgiving has been celebrated nationally on and off since 1789, after Congress requested a proclamation by George Washington.  It has been celebrated as a federal holiday every year since 1864, when, during the American Civil War, President Abraham Lincoln proclaimed a national day of "Thanksgiving and Praise to our beneficent Father who dwelleth in the Heavens," to be celebrated on the last Thursday in November.  Together with Christmas and the New Year, Thanksgiving is a part of the broader holiday season.

Thanksgiving (disambiguation): Thanksgiving is a national holiday celebrated primarily in Canada and the United States:

Armed Forces Day (Poland): Armed Forces Day, known also as the Feast of the Polish Armed Forces (Polish: "Święto Wojska Polskiego" ), is a national holiday celebrated annually on 15 August in Poland, commemorating the anniversary of the 1920 victory over Soviet Russia at the Battle of Warsaw during the Polish–Soviet War.  Armed Forces Day is held in conjunction with the Day of the Assumption of the Virgin Mary, itself a separate public holiday.  The event is marked by military parades, equipment reviews, showcases and remembrances by all branches of the Polish Armed Forces across the country.  One of the most prominent events of the day is in the capital Warsaw, which hosts a large military parade through the city's center.  Originally celebrated during the Second Republic, the holiday was barred by authorities during the communist era beginning in 1947, only to be revived again in 1992.

National Survivors of Suicide Day: National Survivors of Suicide Day was designated by the United States Congress as a day when the friends and family of those who have died by suicide can join together for healing and support.  This day always falls on the Saturday before American Thanksgiving.

Saint-Jean-Baptiste Day: Saint-Jean-Baptiste Day (French: "Fête de la Saint-Jean-Baptiste" ), officially known in Quebec as the National Holiday, (French: "la fête nationale" ) is a holiday celebrated annually on June 24, the feast day of the Nativity of St. John the Baptist.  In Quebec, it is a public holiday with festivities occurring on June 23 and 24 which are publicly financed and organized by a "Comité organisateur de la fête nationale" (National Holiday Organizing Committee).  June 24 is also celebrated as a festival of French Canadian culture in other Canadian provinces and the United States.

Aung Zan Wai: Aung Zan Wai (Burmese: အောင်ဇံဝေ ; 19 November 1893 – 29 December 1984) was a Burmese politician.  He was born in Sittwe, Kyauktaw, British Burma in 1893.  Aung Zan Wai, along with Pe Khin, Bo Hmu Aung, Sir Maung Gyi, Sein Mya Maung, Myoma U Than Kywe were most important negotiators and leaders of the historical Panglong Conference negotiated with Burma national top leader Aung San and other top leaders in 1947.  All these leaders decided to join together to form the Union of Burma.  The signing is now celebrated as a national holiday, Union Day, in Myanmar.

Thanksgiving: Thanksgiving Day is a national holiday celebrated in Canada, the United States, some of the Caribbean islands, and Liberia.  It began as a day of giving thanks for the blessing of the harvest and of the preceding year.  Similarly named festival holidays occur in Germany and Japan.  Thanksgiving is celebrated on the second Monday of October in Canada and on the fourth Thursday of November in the United States, and around the same part of the year in other places.  Although Thanksgiving has historical roots in religious and cultural traditions, it has long been celebrated as a secular holiday as well.

Respect for the Aged Day: Respect for the Aged Day (敬老の日 , Keirō no Hi ) is a Japanese designated public holiday celebrated annually to honor elderly citizens.  It started in 1966 as a national holiday and was held on every September 15.  Since 2003, Respect for the Aged Day is held on the third Monday of September due to the Happy Monday System.

Sham el-Nessim: Sham el-Nisim (Egyptian Arabic: شم النسيم‎ ‎ , "Sham en-Nessim", ] ; Coptic: , "Shom Ennisim") is an Egyptian national holiday marking the beginning of spring.  It always falls on the day after the Eastern Christian Easter (following the custom of the largest Christian denomination in the country, the Coptic Orthodox Church).

Supporting paragraphs: National Survivors of Suicide Day Thanksgiving
Answer: United States Congress