It is a "Hinamatsuri" event in Hagi City, Yamaguchi Prefecture.
At the former Yamamura family residence in the Hamasaki Denken district, a checkered doll called "Hoko-san" was also on display. "Hoko-san and Hoko dolls" are generally given to celebrate the first festival of a baby girl. In the past, they were dressed in maternity clothes, which were also given to the celebration, and decorated with Hina dolls.
It seems like everyone is staring at you, and I'm a little intimidated.