I really like this description of the Motovun Film Festival from the Times’ Wendy Ide:

Why go: For starters, where the hell is Motovun? It’s a hilltop town in Istria, with a population of just 1,000. Here, a hedonistic five-day marathon takes place, with screenings from 10am until 4am – many in the open air. Backpackers camp in the fields beneath the town and are hauled up each day in a tractor-pulled trailer.
How to get tickets: Visit the festival website for details: www.motovunfilmfestival.com
Where to stay: In a tent. Or do like the hardcore festival-goers do and sleep in the gutter where you fell the night before.
Where to drink: Everywhere, throughout the day.

See article.

No, it ain’t Cannes. I can tell you from personal experience that no festival-goers sleep in the gutter at France’s famous festival.

Where is Motovun? Alert visitors to croatiatraveller.com know that Motovun is in Istria (see a map) and accessible (although not easily) by bus. See more about Motovun.