博多はかた祇園ぎおん山笠やまかさでしょう
hakatagion'ya makasadeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 博多祇園山笠

1. Probably Hakata Gion Yamakasa.

Polite
Presumptive
Conjecture