It looks like a Christmas light-up and lantern-floating event will be held on Sunday, December 12, on the east side of Ashiya City Shinsui Chuo Park (west of the International Exchange Center)〜
Quoted from みんなのまちの掲示板ためまっぷ
The event is organized by the “親水公園ファン倶楽部,” co-sponsored by the neighborhood associations of Ashiya Kaigan-dori and Block 1 of Minamihama-cho, with support from Ashiya City.
The lantern floating will take place from 16:00 to 17:00, followed by the lighting ceremony from 17:00. (The event will be held in light rain.)

↑ Shinsui Chuo Park around springtime
It seems this is held every year as a local Christmas event! I’m looking forward to seeing what kind of light-up display they’ll have this year!
Here’s the map↓
The address is 6 Minamihama-cho, Ashiya City, Hyogo Prefecture.



