English version

open day

From Longman Dictionary of Contemporary Englishopen dayˈopen day noun [countable] British English  SSHOW/LET somebody SEE somethinga day when a school or an organization invites the public to come in and see the work that is done there
Examples from the Corpus
open dayOpening success: More than 1000 people visited Middlesbrough botanic centre's open day.Members of the public took the opportunity to see for themselves in a unique open day.
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Word of the day luck out to be lucky