Question: What January 30, 1972 event led to the Whidgery Tribunal?

Context paragraphs:
Bloody Sunday (1972): Bloody Sunday – sometimes called the Bogside Massacre – was an incident on 30 January 1972 in the Bogside area of Derry, Northern Ireland, when British soldiers shot 28 unarmed civilians during a peaceful protest march against internment.  Fourteen people died: thirteen were killed outright, while the death of another man four months later was attributed to his injuries.  Many of the victims were shot while fleeing from the soldiers and some were shot while trying to help the wounded.  Other protesters were injured by rubber bullets or batons, and two were run down by army vehicles.  The march had been organised by the Northern Ireland Civil Rights Association (NICRA).  The soldiers involved were members of the 1st Battalion, Parachute Regiment, also known as "1 Para".

John Widgery, Baron Widgery: John Passmore Widgery, Baron Widgery, (24 July 1911 – 26 July 1981) was an English judge who served as Lord Chief Justice of England and Wales from 1971 to 1980.  He is principally noted for presiding over the Widgery Tribunal on the events of Bloody Sunday.

Dinosaur: Dinosaurs are a diverse group of reptiles of the clade Dinosauria that first appeared during the Triassic period.  Although the exact origin and timing of the evolution of dinosaurs is the subject of active research, the current scientific consensus places their origin between 231 and 243 million years ago.  They became the dominant terrestrial vertebrates after the Triassic–Jurassic extinction event 201 million years ago.  Their dominance continued through the Jurassic and Cretaceous periods and ended when the Cretaceous–Paleogene extinction event led to the extinction of most dinosaur groups 66 million years ago.

Tornado outbreak of February 28 – March 1, 2017: The tornado outbreak of February 28 – March 1, 2017 was a widespread and significant outbreak of tornadoes and severe weather that affected the Midwestern United States at the end of February 2017 and beginning of March.  Fueled by the combination of ample instability, strong wind shear, and rich low-level moisture, the event led to 72 confirmed tornadoes and thousands of other non-tornadic severe weather reports.  The most notable aspect of the outbreak was a long-tracked EF4 tornado—the first violent tornado of 2017 and the first violent tornado during the month of February since the 2013 Hattiesburg, Mississippi tornado—that tracked from Perryville, Missouri to near Christopher, Illinois, killing one person.  Three EF3 tornadoes were recorded during the event, including one that caused two fatalities in Ottawa, Illinois, one that caused a fatality near Crossville, and one that heavily damaged or destroyed homes in and around Washburn.  In addition to the deaths, 38 people were injured by tornadoes and an additional 30 were injured by non-tornadic impacts, mainly by fallen trees.

Tomáš Kučera (skier): Tomáš Kučera (born August 8, 1948) was Czechoslovakian nordic combined skier who competed in the late 1960s and early 1970s.  Competing in two Winter Olympics in the Nordic combined event, he finished fourth in the 1968 event and sixth in the 1972 event.

George Reddy: George Reddy (died 14 April 1972) was a research student in physics at Osmania University, in Hyderabad, India, who was murdered on 14 April 1972 in a student hostel by right-wing elements, aged 25.  His death resulted from his controversial involvement in left wing movements .  The event led to the formation of the Progressive Democratic Students Union (PDSU), a student body on the campus of the university that took its name from the "PDS" imprint that Reddy had used when publishing pamphlets.

Grand Prix des Frontières: The Grand Prix des Frontières was a motor race held at a street circuit in Chimay, Belgium.  The race was created by Jules Buisseret, who was also responsible for the circuit's existence.  The first event was held in 1929 and was discontinued after the 1972 event for safety reasons.

Animal (Kesha album): Animal is the debut studio album by American singer and songwriter Kesha.  The album was released on January 1, 2010 through RCA Records and distributed through Sony Music Entertainment.  Kesha worked with a variety of record producers and songwriters such as Lukasz "Dr. Luke" Gottwald, Benny Blanco, David Gamson, Greg Kurstin, Max Martin and others.  Kesha had been recording demos for several years when one eventually ended up in the hands of Samantha Cox, senior director of writer/publisher relations at BMI.  Cox passed along the demo and it ended up in the hands of Gottwald, who decided to have Kesha perform on the song "Right Round".  Within two months, the song became a hit in multiple countries around the world.  The event led to Kesha being sought after by many major labels, and she eventually signed a multi-album deal with RCA Records.

Venues of the 1972 Winter Olympics: For the 1972 Winter Olympics in Sapporo, Japan, a total of twelve sports venues were used.  A thirteenth venue which was a reserved luge course was constructed, but never used in actual competition.  Construction on all but of the venues used took place between 1968 and early 1971 in time for the test events.  The Tsuskisamu Indoor Skating Rink was not completed until late 1971 or early 1972 because the number of teams scheduled to compete at the 1972 Games was not known.  At the actual luge venue used, a malfunctioning starting gate during the first run led to the results being cancelled and rerun being ordered.  The results of this event led to the only tie in Olympic luge history.  The ski jumps at Miyanomori and Okurayama served as host venues for the FIS Nordic World Ski Championships thirty-five years later.

2005 Woodvale Atlantic Rowing Race: The 2005 race saw 20 doubles, 4 fours and 2 solos depart La Gomera on 30 November 2005 to race to Antigua.  The start was originally scheduled for 27 November but Tropical Storm Delta, and its accompanying bad weather, delayed the start.  Unprecedented bad weather during the event led to 6 boats retiring from the race.

Supporting paragraphs: John Widgery, Baron Widgery Bloody Sunday (1972)
Answer: Bloody Sunday