Final answer:
The statement "Please join me in toasting our new mayor..." is a call to action in a conclusion, inviting audience participation and focusing on future engagement.
Step-by-step explanation:
The statement "Please join me in toasting our new mayor..." illustrates the part of a conclusion that involves a forward-looking statement or a call to action. It is an invitation for the audience to participate in an action that both celebrates the current occasion and implies future engagement. This part of the conclusion is often used in speeches to give a productive rhetorical finish by involving the audience and giving a sense of communal participation and hope for what comes next.