Board Thread:Naruto Gaiden/@comment-25549954-20150527164334/@comment-25319479-20150528084029

Alrighty, Naruto only became Hokage recently, as when we saw him play with Boruto and Himiwari in the last, his face was not on the Hokage monument.

So seeing as he attended this meeting as Hokage, it would take place either during Boruto's academy days before chapter 700 or between 700 and gaiden.