Webster's Revised Unabridged Dictionary · 1913

Fiesta

Fiesta , noun

[Sp. See Feast, n.]

1.
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
2.
an organized series of acts and performances.