Posting Events:
If you are organizing or sponsoring an event, post the event on the Events page. To just inform us of public events of interest, post that as a Forum discussion, under `Events of Interest`.

Communicating:

For private communication, use the `Send a Message` feature on the Members page {upper-left}. An internal email will be sent to the member`s Inbox {main page, upper-right}.
For public communication, use the `Comment Wall`. This comment is seen by anyone visiting that Members page.

From each Groups page, you can send a message to all other Group members (if you are a member of that Group).