social event vs event

social event and event both are nouns.

Word	Noun	Adjective	Verb	Adverb
social event	Yes	No	No	No
event	Yes	No	No	No

As nouns, event is a hypernym of social event; that is, event is a word with a broader meaning than social event:

social event (noun)	event (noun)
an event characteristic of persons forming groups	something that happens at a given place and time
	a phenomenon located at a single point in space-time; the fundamental observational entity in relativity theory
	a phenomenon that follows and is caused by some previous phenomenon
	a special set of circumstances