yard sale vs sales event

yard sale and sales event both are nouns.

Word	Noun	Adjective	Verb	Adverb
yard sale	Yes	No	No	No
sales event	Yes	No	No	No

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

yard sale: an outdoor sale of used personal or household items held on the seller's premises
sales event: an occasion (usually brief) for buying at specially reduced prices

Other hypernyms of yard sale include cut-rate sale, sale.

yard sale (noun)	sales event (noun)
an outdoor sale of used personal or household items held on the seller's premises	an occasion (usually brief) for buying at specially reduced prices