Simplify the following text for a Grade 7 native English-speaking person.
Original: The Administrative Block houses three Lecture Theatres , an AV Theatrette and a Band Room .
Simplified: RI has three lectures theaters , an AV Theatrette and a Band Room . Sometimes , people have classes in the three lecture theaters and the AV Theatrette instead of their classroom , while sometimes , teachers meet in these theaters .