convene vs summon

convene and summon both are verbs.

Word	Noun	Adjective	Verb	Adverb
convene	No	No	Yes	No
summon	No	No	Yes	No

As verbs, summon is a hypernym of convene; that is, summon is a word with a broader meaning than convene:

convene (verb)	summon (verb)
call together	make ready for action or use
meet formally	call in an official matter, such as to attend court
	ask to come
	gather or bring together
	cause to become available for use, either literally or figuratively