Final answer:
The significant event at Georgetown University in 1989 is not specified, but likely relates to the geopolitical events surrounding the end of the Cold War, including the signing of the START and the eventual collapse of the Soviet Union.
Step-by-step explanation:
The significant event that Georgetown University (GU) hosted in 1989 was not explicitly mentioned in the provided information. However, broader historical context from that period indicates the event is likely related to the end of the Cold War and the geopolitical changes taking place at the time. Within this frame, important events such as the Strategic Arms Reduction Treaty (START) and the collapse of the Soviet Union were defining moments.
By 1989, indicators such as the non-intervention of the Soviet Union in matters where they previously would have exerted force (like Budapest in 1956 and Prague in 1968), signaled the weakening of the Soviet state. President George H.W. Bush, carrying forward the relationship established by President Reagan with Mikhail Gorbachev, played a role in fostering the end of the Cold War without heightening hostilities. This approach led to the signing of the Strategic Arms Reduction Treaty and indirectly to the eventual dissolution of the Soviet Union, symbolizing the end of the Cold War era. If GU hosted a specific event in relation to these developments, it would have been significant given the epochal global changes occurring in 1989.