go on vs occur

go on and occur both are verbs.

Word	Noun	Adjective	Verb	Adverb
go on	No	No	Yes	No
occur	No	No	Yes	No

As verbs, go on and occur are synonyms defined as:

Other synonyms of go on include come about, fall out, hap, happen, pass, pass off, take place.

go on (verb)	occur (verb)
come to pass	come to pass
continue talking	come to one's mind; suggest itself
start running, functioning, or operating	to be found to exist
move forward, also in the metaphorical sense
continue a certain state, condition, or activity