Oslo's major events, ranked by crowd impact
Every event here is verified by a person, dated from its own organiser, and measured against Oslo's day-by-day crowd forecast — so they can be ranked on one scale. "Major" here means an event we have checked and approved as one of Oslo's biggest, whose days our own forecast reads Busy or Packed — or, for now, sit beyond the forecast window. See the city, day by day →
Calm · Lively · Busy · Packed rank a day against Oslo's own year — not a headcount.
Oslo Marathon (DNB Oslo Maraton) →
12 September 2026 — we checked these dates against the organiser's own site
The 2026 Oslo Marathon in Oslo runs 12 Sep 2026, confirmed; expect Packed days — busier than 99% of Oslo's year. (Avoid-Crowds, as of 2026-09-10; recomputed nightly.)
Norwegian Constitution Day (Syttende Mai) →
17 May 2027 — we checked these dates against the organiser's own site
The 2027 Norwegian Constitution Day in Oslo runs 17 May 2027, confirmed; expect Packed days — busier than 99% of Oslo's year. (Avoid-Crowds, as of 2026-09-10; recomputed nightly.)
Planning Oslo around these dates? Timed entries and tours matched to the day's forecast
Who writes the city guides · Disclaimer — event dates can change; expected dates are labelled and can move.