What is another word for special session?
Pronunciation: [spˈɛʃə͡l sˈɛʃən] (IPA) 
Special session is a phrase used frequently in government or political circles, meaning a meeting called for a specific purpose or issue. However, there are a number of other phrases that could be used to describe a similar meeting. Some possible synonyms for special session include extraordinary session, emergency session, ad-hoc session, or unscheduled session. These phrases all suggest that the meeting is being called outside of regular procedures or timings, and is intended to address an urgent or pressing matter. Whether it is called an emergency meeting, an ad-hoc session or an unscheduled gathering, the aim is always to give urgent attention to issues that cannot wait until the next scheduled session.
