order of the day

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The business to be considered or done by a legislature or other body on a particular day.
• noun The characteristic or most significant aspect or activity.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun the business to be done by a body (such as a legislature) on a particular day; an agenda
• noun the most significant aspect of something

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the order of business for an assembly on a given day