London's major events, ranked by crowd impact
Every event here is verified by a person, dated from its own organiser, and measured against London'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 London'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 London's own year — not a headcount.
New Year's Eve fireworks →
31 December 2026 — expected — not yet confirmed
The 2026 New Year's Eve fireworks in London is expected on 31 Dec 2026 — the date can move; expect Packed days — busier than 99% of London's year. (Avoid-Crowds, as of 2026-09-10; recomputed nightly.)
Notting Hill Carnival →
29–30 August 2027 — we checked these dates against the organiser's own site
The 2027 Notting Hill Carnival in London runs 29–30 Aug 2027, confirmed; expect Packed days — busier than 99% of London's year. (Avoid-Crowds, as of 2026-09-10; recomputed nightly.)
TCS London Marathon (first two-day edition) →
24–25 April 2027 — we checked these dates against the organiser's own site
The 2027 TCS London Marathon in London runs 24–25 Apr 2027, confirmed; expect Packed days — busier than 99% of London's year. (Avoid-Crowds, as of 2026-09-10; recomputed nightly.)
Planning London 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.