Gakuto is keeping his class observation day from Hayato by using a stand-in. 
I'm going to Gakuto's class visitation.
Ich werde zu Gakus Elternbesuchstag gehen.
Iré al día de visita al aula de Gaku.
Je vais aller
aux portes ouvertes de Gaku.
Andrò alla visita a scuola di Gaku.
Eu irei à visitação do Gaku.
Я пойду на открытый урок Гаку.