cafetorium

A cafeteria that also houses a multi-purpose stage. Usually found in public schools. Most include a stage, speakers, some sort of lighting and lighting controls. Usually acts as auditorium in the absence of an auditorium from a school. Does not include fixed audience seating and few have a control booth. Doubles as school cafeteria and auditorium.

Some can be quite nice:
auditeria_cafetorium.jpg

See also auditeria. Here's a good PDF on some design criteria of multi-purpose spaces in a school: http://www.ncef.org/pubs/multipurp.pdf .