के_लिए: Circumstance ~> Circumstance
In this context के लिए means "on the occasion of." Arguably this is related to the [ss Purpose--Purpose] sense of के लिए.
> Is perhaps [ss Circumstance--Purpose] a better fit?
* [gex 001 "{जन्मदिन birthday} {[pspecial "के_लिए" hi/ke-lie Circumstance--Circumstance] for} {क्या what} {किया did}{? ?}" "What did you do for your birthday?"]