noun
international film festival
Refers to a film festival with international participation, such as Cannes or Tokyo International Film Festival.
今年の国際映画祭には多くの国から作品が集まった。
Films from many countries were gathered at this year's international film festival.
A general film festival, not necessarily international. 国際映画祭 explicitly includes international participation.
Compound of 国際 (international) + 映画 (film) + 祭 (festival). A straightforward modern coinage.