sales event vs occasion

sales event and occasion both are nouns.

Word	Noun	Adjective	Verb	Adverb
sales event	Yes	No	No	No
occasion	Yes	No	Yes	No

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

sales event: an occasion (usually brief) for buying at specially reduced prices
occasion: an opportunity to do something

sales event (noun)	occasion (noun)
an occasion (usually brief) for buying at specially reduced prices	an event that occurs at a critical time
	a formal or official social gathering or ceremony of people
	a rational motive for a belief or action
	an opportunity to do something
	the time of a particular event

sales event (verb)	occasion (verb)
	give occasion to