May 31 Anniversaries

World No Tobacco Day

World Observances

What Is World No Tobacco Day? May 31st is "World No Tobacco Day," an internation...

Reclaimed Lumber Day (Kozai no Hi) — 5/31, from "ko(5)-za(3)-i(1)"

Industry Days

What Is Reclaimed Lumber Day? May 31st is "Reclaimed Lumber Day" (古材の日, Kozai no...

Vegetable Day (Sai no Hi)

Wordplay Anniversaries

What Is Vegetable Day? The 31st of every month is "Vegetable Day" (菜の日, Sai no H...