Final answer:
The correct answer is 'commemoration,' as it involves honoring individuals or events at functions like banquets and awards dinners, which is the primary purpose of special occasion speaking at such events.
Step-by-step explanation:
Special occasion speaking often includes events like banquets, awards dinners, and roasts, which typically have the purpose of honoring individuals, institutions, or events. These functions are characterized by paying tribute to honorees or recognizing memorable moments or milestones.
Hence, the suitable function of special occasion speaking in these contexts is commemoration. The term 'commemoration' specifically refers to the act of remembering and showing respect for someone or something in a ceremony. It implies a more formal and respectful approach, potentially including elements of inspiration and entertainment but primarily focused on honor and remembrance.