Hyakumangoku Matsuri (百万石まつり) is an annual festival in Kanazawa commemorating the entry of the feudal lord Maeda Toshiie into Kanazawa Castle in 1583. The festival last three days and centers on the first Saturday of the month of June when the Hyakumangoku Parade—a procession involving historical dress and traditional dancing—begins in the afternoon (2pm to 6pm). There is also a historical re-enactment, a ceremony in front of Kanazawa Station’s huge wooden gate, and a bonfire at Kanazawa Castle. On the Friday night before (7pm to 9pm) the Kaga Yuzen Toro Nagashi sees a mass of candles released down Asanogawa River and across the Asanogawa Ohashi Bridge. On the Sunday, there is a traditional tea ceremony in and around the famous Kenrokuen Garden. See here for a full schedule of events (Japanese only).
Event details are taken from official sources whenever possible. It is always prudent to check the official event website before attending to make sure that there have not been any changes. If you know of an error in the calendar, then please let me know through the contact form.