A high-impact event is a scheduled release or announcement that an economic calendar rates as the most likely to coincide with large price moves, often marked in red or with three icons. Examples include interest rate decisions, inflation (CPI) and Non-Farm Payrolls (NFP). The rating is the calendar provider's estimate of how active markets may be, not a forecast of direction, and spreads can widen around these events.
Also called: high-impact news, major news release, red news
Hypothetical example
Hypothetically, a calendar shows three releases for the day: a consumer confidence survey rated low impact, a trade balance rated medium impact and an interest rate decision rated high impact.