Event calendar distribution to/and sycronization of, between multiple drupal web sites

Here is the background of the practical issue I desire to resolve: I am blogging on www.realneo.us in Northeast Ohio (NEO). Realneo is a Drupal site which, along with other NEO Drupal sites, is involved in civic and environmental posting and discussion.
I am constantly reading other site’s event calendars and then copying events to Realneo’s event calendar. This takes attention and time. I also log in and post events on other sites.

The Drupal feature that I desire is an event module which supports automatic syndication of events posted to one Drupal calendar to other Drupal calendars (whose administrators) chose to subscribe to the syndication.

Let’s say we have Drupal web sites A, B, C who conduct discussions involved with wind energy. The Administrator of A, would set permissions to allow/disallow event postings on any or all of the other sites to automatically be uploaded to the A calendar. Administrators of B and C would have similar permissions.

This way, rather than forcing a citizen - who is trying to inform the public about a lecture on wind energy - to log in at A, B, and C to post the event, each site administrator would determine which other sites – usually sites with similar content interests – would be automatically syndicated and published to their events calendar.

I see event syndication as a critical element of web democratization: more rapidly and effectively connecting individuals with real world events in which they are interested.

Thanks in advance for any direction to an existing module, or, if there is no such existing software, to a development group for such a module. I am interested in determining the parameters and cost of such a module.

Please advise if I have submitted this issue in less than the best catagory (ie "project", "version","component".

Best,

Jeff Buster