Final answer:
The question likely refers to year-end business activities for Turnbull on December 31, 2021, which may include preparing financial statements and reflecting on the company's first year of operations.
Step-by-step explanation:
Without additional context, it's difficult to pinpoint what specific event happened to 'Turnbull' on December 31, 2021. In the realm of business studies, such a date may signify the end of a fiscal year, which could entail different financial actions for a company. If Turnbull is a business entity, the end of its first year of operations could involve preparing financial statements, evaluating annual performance, conducting inventory counts, reconciling accounts, or completing tax documentation. These year-end activities are crucial for businesses to understand their financial position and tax obligations, and to prepare for the upcoming year. The mention of Turnbull's 'first year of operations' suggests that this could be a startup that is closing its initial fiscal year, thus requiring thorough analysis to plan future growth strategies and report to stakeholders, including investors and regulatory entities.