Iceland's festival calendar is shaped by its extreme seasons — midwinter celebrations push back against the darkness, and summer events make the most of the endless light.
Þorrablót (January–February) is a midwinter Viking festival, traditionally held on the first Friday after the 19th of January. It's not a tourist event — it's a community tradition, usually organized by social clubs and associations. The meal consists of traditional preserved foods: fermented shark (hákarl), singed sheep's head (svið), liver sausage, blood pudding, and dried fish, all washed down with Brennivín. If you're in Iceland during this period and can wrangle an invitation, go.
Reykjavík Winter Lights Festival (February) — Reykjavik marks the return of longer days with light installations across the city, outdoor swimming pool open days, and a museum night when institutions open for free after dark.
Icelandic Independence Day (June 17) celebrates the founding of the Icelandic Republic in 1944. Parades, outdoor concerts, and general festivity in Reykjavik and around the country. One of the liveliest days to be in the capital.
Viking Festival, Hafnarfjörður (June) — a longship comes to port, and there are Viking markets, reenactments, and archery demonstrations in a Reykjavik suburb. Touristy but entertaining.
Reykjavik Street Food Festival (July) — food trucks gather in Hljómskálagarður park for a weekend of eating. Good way to sample a range of Icelandic cooking in one place.
Verslunarmannahelgi (first weekend in August) is the bank holiday weekend, when Icelanders pour out of Reykjavik and camp in the countryside. The Westman Islands host a huge outdoor music festival (Þjóðhátíð) that has been running since 1874. A chaotic and genuinely local event.
Reykjavík Culture Night (August) — the city closes to traffic, galleries and museums open late, and over 100,000 people wander the streets. Culminates in fireworks over the harbor. One of the best days to be in Reykjavik.
Reykjavík International Film Festival (September/October) — a well-regarded festival with international and Icelandic programming. Good for film-minded visitors in the shoulder season.