Variety provides some insight on The Office table read for the season 7 finale, Search Committee.
[Paul] Lieberstein wrote the season finale, and once everyone gathers, two rows deep, around the rectangular conference table, the reading begins. Since “The Office” isn’t filmed in front of a studio audience, this is the best and only opportunity the writers have to hear the episode read from start to finish and gauge how it plays.
Link: ‘Office’ table read