YOU SAID:

I hope I can go to the party this afternoon

INTO JAPANESE

今日の午後パーティーに行けるといいのですが

BACK INTO ENGLISH

I hope I can go to the party this afternoon.

INTO JAPANESE

今日の午後のパーティーに行けるといいのですが。

BACK INTO ENGLISH

I hope I can go to the party this afternoon.