event vs hackathon

event and hackathon both are nouns.

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

As nouns, hackathon is a hyponym of event; that is, hackathon is a word with a more specific, narrower meaning than event:

event (noun)	hackathon (noun)
something that happens at a given place and time	an event involving a marathon coding session
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