appreciation party; recognition gathering
A social event held to thank someone for their hard work or service, often in a workplace or organizational context.
We held an appreciation party to celebrate the project's success.
A recognition gathering is planned for the department head's retirement.
A casual wrap-up party after an event or project, while 慰労会 is more explicitly about recognizing someone's contributions.
Compound of 慰労 (いろう, 'recognition of services') and 会 (かい, 'gathering').