Festival
is that festival is an event or community gathering, usually staged by a local community, which centers on some theme, sometimes on some unique aspect of the community while fiesta is (in spanish speaking countries) a religious festival. A fiesta is a celebration or a party.
Fiesta
A fiesta is a celebration or a party. You can use the word fiesta for any party, but it usually refers to a large feast, festival, or very extravagant party. In Spanish, fiesta means "feast," and in many Spanish-speaking places, a fiesta celebrates a saint's day or other religious occasion.
