literally Flag Day, is the annual celebration of the arrival of the year's first herring (Hollandse Nieuwe) in Scheveningen. Hundreds of thousands of people gather in Scheveningen for the festivities, and the fishing boats are decorated specially for the occasion. In addition to the omnipresent herring, this day also features a number of activities unrelated to fish. In Scheveningen, the first barrel of herring is traditionally sold at an auction on the Thursday preceding the official Vlaggetjesdag, and the proceeds go to charity. Vlaggetjesdag was made official in 1947, although the festive tradition around the beginning of herring season is much older: in the 18th century, the villages along the coast, including Scheveningen, were forbidden to gut the caught herring. Since herring was most appropriate for smoking around September, most fishing boats caught flatfish or round-bodied fish during part of the summer, so as to avoid a surplus of fresh herring. In July or August, The Hague hosts a series of weekly firework displays by the sea front in Scheveningen, as part of an international fireworks festival and competition. Tong Tong Fair, formerly Pasar Malam Besar, is the largest festival in the world for Indo culture. Established in 1959, it is one of the oldest festivals and the fourth largest grand fair in the Netherlands. It is also the annual event with the highest number of paying visitors of The Hague, having consistently attracted more than 100,000 visitors since 1993. The Milan Festival is Europe's biggest Hindustani open-air event, annually held in Zuiderpark. The Hague also hosts several annual music festivals; on the last Sunday in June, the city hosts Parkpop, the largest free open air pop concert in Europe. Crossing Border Festival, State-X and The Hague Jazz festival are among other music festivals in The Hague. Crossing Border Festival is an annual festival in November, focusing on music and literature. The first edition took place in 1993. Movies That Matter is an international film and debate festival about peace and justice that takes place every year at the end of March; nine days filled with screenings of fiction films and documentaries, daily talk-shows, music performances and exhibitions. The first such event took place in 2006. Moreover, The Hague International Model United Nations, annually held in January, is a five-day conference held at the World Forum, gathering over 4,000 students from over 200 secondary schools across the globe. It is