A special session.

Such would be a special session or perhaps a called session of Congress.

The President of the United States has the authority to call for a special session of Congress. This may be done to address urgent matters or to convene lawmakers outside of their regular schedule.

When an unscheduled session is called by the President it is called a special session. Special sessions may be convened to address special topics, or emergencies such as war or natural disaster.

to address the economic crisis