Anniversaries of important events, memorial dedications, and speeches of tribute are occasions that call for the function of special occasion speaking.

The correct answer is :  commemoration

Explanation:

It is the act of remembering something and by doing so people honor it.  This word has a clear echo of memory in it. It helps to keep things in your mind in a special celebration. It marks something special from the ordinary. It can be said that is a formal tribute to a loved thing.

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