an item or concept introduced or transmitted from a foreign land / something that is handed down from earlier generations, an heirloom

be introduced from a foreign country / hand down from generation to generation

festival / ceremonial

(honorific) festival

(archaic) antique, old-fashioned / (colloquial) ancient

ancient times, antiquity, remote ages

summer festival

The Japanese festival of Hina matsuri, held on 3 March.

A ceremony celebrating the beginning of spring.

"balse festival": the mass tweeting of "balse!" that takes place when Castle in the Sky is broadcast on television