At the end of each day, the Tokyo Game Show booth companions line up in front of their respective booth. Then then bow one-by-one as evident here in this Kotaku Japan clip of Sony's booth.
Some of the booth companions give deeper bows than others. A lesson in politeness!
［ #tgs2010 ］お疲れ様でした、また来年！ SCEコンパニオンからのご挨拶（動画あり） [Kotaku Japan]