jumble sale vs sales event

jumble sale and sales event both are nouns.

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

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

jumble sale: a sale of donated articles
sales event: an occasion (usually brief) for buying at specially reduced prices

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

jumble sale (noun)	sales event (noun)
a sale of donated articles	an occasion (usually brief) for buying at specially reduced prices