2, 3, 12. Call, invite, summon imply requesting the presence or attendance of someone at a particular place. Call is the general word: to call a meeting. To invite is to ask someone courteously to come as a guest, a participant, etc., leaving the person free to refuse: to invite guests to a concert; to invite them to contribute to a fund. Summon implies sending for someone, using authority or formality in making the request and (theoretically) not leaving the person free to refuse: to summon a witness, members of a committee, etc.

Did you mean call off?