Final answer:
Two elections under universal suffrage in Hong Kong's outcome are unpredictable due to changing political dynamics. Elections differ worldwide, with various systems like direct democracy, proportional representation, or controlled elections depending on the country. Factors such as compulsory voting laws influence voter turnout as seen in comparisons between countries.
Step-by-step explanation:
The question pertaining to whether two elections under universal suffrage in Hong Kong have occurred, have not occurred, are currently underway, or are unpredictable is a matter that is best answered as unpredictable due to various political and social factors that influence electoral processes in Hong Kong. This type of question falls under the subject of Social Studies, specifically within the study of government and politics. In relation to the provided information on different electoral systems and practices around the world, it is clear that elections can vary greatly from one country to another, with some countries employing direct democracy methods such as ballots and referendums and others having more controlled or unique systems. For example, the U.S. elections which feature the first-past-the-post electoral system and an electoral college, while Japan has a mixed system involving both plurality votes in single-member constituencies and proportional representation. Other information, such as the fact that compulsory voting laws can lead to higher voter turnout rates as seen in countries like Belgium, Turkey, and Australia, compared to the United States, provides insight into the factors that can influence electoral participation. Furthermore, general characterizations of elections, such as snap elections and non-fixed election dates in Britain, show the diversity of election systems and practices. Ultimately, what this means for Hong Kong remains subject to change and shifting political dynamics, making any definitive answer on the predictability of elections challenging.