A growing number of initiatives and people engaged will facilitate an increase in contacts. However, alongside these "natural" processes, extra stimulation of intra-initiative communications and contacts will make sense.
UrbanCamp is a good example of face-to-face interaction.
Virtual sites where representatives of the initiatives may share experiences, network and get to know what their city project colleagues do can become an alternative incentive. Adding more information about projects, initiatives, and ideas of other initiatives will help to go beyond the framework of focal closure.