Kirk here with a pair of events that are already underway at Grandmesse. First, here’s a link to an English page about the venue:
https://www.grandmesse.jp/kiji00376/index.html
One event is a craft fair. The image you see (light orange?) is a coupon that will reduce your entry fee from 500 yen to 400 yen. Here’s a page will information about the many booths:
https://spice-country.jp/#%E5%87%BA%E5%B1%95%E8%80%85%E4%B8%80%E8%A6%A7
Another event being held simultaneously is a ceramics (and pottery) fair. Here’s a URL for that: