博多 はかた祇園 ぎおん山笠 やまかさであれば
hakatagion'yamakasadeareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of 博多祇園山笠

1. If it were Hakata Gion Yamakasa…; If the Hakata Gion Yamakasa were to happen…

Ba Conditional