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Calvin Day
April 10
Calvin Day is celebrated on April 10, 2026. A fun excuse to learn something new or gather your favorite people.
Photo: Andrew Filer from Seattle (ex-Minneapolis) via Wikimedia Commons.
Calvin Day is celebrated on April 10, 2026. A fun excuse to learn something new or gather your favorite people.
Photo: Andrew Filer from Seattle (ex-Minneapolis) via Wikimedia Commons.