A time of glory or ascendancy.

Any of various public holidays in various countries to commemorate victories in important battles or wars in the countries' history.

Easter Monday, as observed by Polish descendants in English-speaking countries.

A casual event where an institution is open for inspection by anyone interested.

A school attended during the day, as opposed to a boarding school.

Temporary liberation from a prison, for the period of one day. / Paid leave of absence from employment (one day per week) to attend college.

(religion) A syncretic monotheistic religion founded in the 20th century in Vietnam, which worships a deity of the same name.

A special one-day sale during which retail goods are offered for one dollar or at very reduced prices. / (slang, by extension) An occasion considered special or worth enjoying.

Current; of the present. / (informal) Designating a present-day version of someone or something in history.

(idiomatic) An excursion, returning home on the same day.