open house

Từ điển Oxford Advanced Learner 8th

ˌopen ˈhouse [open house] BrE NAmE noun
1. uncountable, singular a place or a time at which visitors are welcome
•It's always open house at their place.
2. (NAmE) (BrE ˈopen day)countable a day when people can visit a school, an organization, etc. and see the work that is done there
3. countable (NAmE)a time when people who are interested in buying a particular house or apartment can look around it
See also: ↑open day