YOU SAID:
I'm going to a concert
INTO JAPANESE
コンサートに行くつもりです
BACK INTO ENGLISH
i'm going to the concert
INTO JAPANESE
コンサートに行きます
BACK INTO ENGLISH
going to a concert
INTO JAPANESE
コンサートに行く
BACK INTO ENGLISH
Go to a concert
INTO JAPANESE
コンサートに行きます
BACK INTO ENGLISH
going to a concert
INTO JAPANESE
コンサートに行く
BACK INTO ENGLISH
Go to a concert
it is unlikely that this phrase will ever reach equilibrium