You don't see a speech tho.
precisely. Pastilah mereka datang dengan maksud mendengarkan pidatonya
The only difference between my answer and the official one is penduduk dia va penduduknya...sama?
You appear to have used penduduk instead of pendukung. If so that was why you were marked wrong.
"Pendukung dia" is not accepted eiher, for some mysterious reason.
You come to hear a speech or you come to watch a speech. Duo, you do not come to see a speech.