This map shows the parade route and times for Monday's Fujisakigu Autumnal Reitaisai. I recommend catching the parade very early in the morning (at starts at 6 AM) while everyone is fresh and full of energy (and not too drunk).
http://www.fujisakigu.or.jp/reisai/onmitisuji.html
熊本市の総鎮守といわれる藤崎八旛宮。秋には1070余年の歴史と伝統を誇る秋季例大祭が行われています。