open day

British

noun

Also called: at-home. US and Canadian name: open house. an occasion on which an institution, such as a school, is open for inspection by the public

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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open day

Their first open day was a hit, attracting over 5,000 visitors, twice the previous daily record.

From BBC ● May 1, 2026

BAS also holds an open day in March.

From BBC ● Feb. 22, 2026

"The biggest factor was the open day," she says, "and going to the school and listening to the head teacher talk about his vision."

From BBC ● Nov. 11, 2025

An open day for prospective applicants will be held at the Scunthorpe Conference Centre, on Brigg Road, on 17 May between 10:00 and 16:00 BST.

From BBC ● May 7, 2025

These programs open windows on a computer screen that stay open day and night.

From "Geeks: How Two Lost Boys Rode the Internet Out of Idaho" by Jon Katz

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023