company outing; company retreat; employee trip
A trip organized by a company for its employees, often for team-building or leisure. Typically refers to domestic group travel.
This year's company outing is planned for Hakone.
We stayed at a hot spring inn on the company trip.
慰安旅行 is a more formal term for a company-sponsored recreational trip, often emphasizing employee welfare. 社員旅行 is the common, everyday term.
社内旅行 is a near-synonym, but 社員旅行 is more common and directly means 'employee trip'.
Compound of 社員 (employee) and 旅行 (travel).