I am working for the United Nation in Copenahgen and I successfully installed WP (http://un-cafe.org). Now I want to create a social platform where U.N. people mainly can create events + invite members to the event that they create. Also it would be nice to have private messaging and chat room. I would like to avoid to create groups or forum.
should I install one of the following BuddyPress, WP Symposium or WP Mingle? or I should keep work press and customize it with the best social plugins available?
Do you know where I can find a good advice?