Task: Translation
Input (Japanese): そのため、「今日はお祝いだ」と抗議集会主催者のHordurTorfason氏は知らせを聞いて歓声を上げる群集に言った。
Output (English): Therefore "today is a celebration," said protest organizer Hordur Torfason to the crowd who were cheering about hearing the news.