### Clue: Special celebration for Socialist landlord, always pursuing end of need (3,6,3)
### Answer: RED LETTER DAY 
 ### Explanation: Definition: Special celebration
 RED(Socialist/one with left-wing views) + LETTER(a landlord/one who lets out property) + [AY(always/forever) **placed below**(pursuing/going after, in a down clue) **last letter of**(end of) "need"].