go on vs come about

go on and come about both are verbs.

Word	Noun	Adjective	Verb	Adverb
go on	No	No	Yes	No
come about	No	No	Yes	No

As verbs, go on and come about are synonyms defined as:

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

go on (verb)	come about (verb)
come to pass	come to pass
continue talking
start running, functioning, or operating
move forward, also in the metaphorical sense
continue a certain state, condition, or activity