Fiesta \Fies"ta\, n. [Sp. See Feast, n.]

Among Spanish, a religious festival; a saint's day or holiday; also, a holiday or festivity.

Even . . . a bullfight is a fiesta. --Am. Dialect Notes.

Some fiesta, when all the surrounding population were expected to turn out in holiday dress for merriment. --The Century.

Source: Webster's Revised Unabridged Dictionary (1913)