1. adjective /ˈfɛstəvəl/
Pertaining to a feast or feast-day. (Now only as the noun used attributively.)
the temple of the Gods [...] / Whom all the people decke with girlands greene, / And honour in their festiuall resort [...].
2. noun /ˈfɛstəvəl/
a) an event or community gathering, usually staged by a local community, which centers on some theme, sometimes on some unique aspect of the community.
See Also: festive, festivities
Wikipedia foundation.