Reference: ad-Durar an-Naadhirah fil-Fataaawa al-Mu’aasirah – Page 645
Ibraaheem Aal ash-Shaykh – ad-Da’wah 1576, Ramadhaan 1417AH
Question: Some employees, when they [retire] or get promoted or [even] get a job, they have a party, so what is the ruling regarding that?
Response: There is no harm in having a party on the occasion of a [retirement] or gaining a promotion as this is a permissible act.