[Plugin: The Events Calendar] Add a "share" button into Events, Venues and Oragnizers ?

Hey Manu. Thanks for the note; while I’m not sure of any specific plugin that can accomplish what you’re going for, I know other users have been able to accomplish what you’re going for via a third party plugin (as events are just a custom post type and should generally be recognized as such by outside social plugins). Share This may be worth a go: http://wordpress.org/extend/plugins/share-this/. No guarantees it’ll integrate smoothly but it seems to be generally quite popular.