open house
noun
1- a place or situation in which all visitors are welcome开放场所; 欢迎来客：
mass noun they kept open house, entertaining a wide variety of artists and writers.他们随时欢迎来客, 接待各种各样的艺术家和作家。
1.2
- N. Amer. & Austral./NZ an occasion during which a dwelling that is for sale may be viewed by prospective buyers without an appointment〈北美, 澳/新西兰〉（潜在买主不需预约的）现场看房。