Another organization held more informal quarterly half-day meetings that included presentations about a wide variety of topics and allowed considerable time for members to develop personal contacts and have face-to-face discussions.
Another organization did not hold any meetings at all. 
mnli hypothesis: Another organization did not hold any meetings at all.  premise: Another organization held more informal quarterly half-day meetings that included presentations about a wide variety of topics and allowed considerable time for members to develop personal contacts and have face-to-face discussions.