Gakushu Hapyou Kai.

or "Day to come and see what we learned in school".

 The son's is second row from the bottom, second from the left.

So today I was up for attending the son's kindergarten performance.  Very cute as these things tend to be for kindergartens.  And a surprising reminder that the Japanese school year is fast drawing to a close.  Here is some video of the little guy in action.  The editing leaves a lot to be desired.