Calendify - Calendify is an event community where you can share, publish, and subscribe to event calendars. It helps you to stay informed about what you are interested in and what is yet to come.
SameTunes - Music social network to compare, share, and discover music.
Upcoming.org - A simple way to share and discover interesting events
humit - A social networking app for music sharing and discovery.
Colloq.io - Discover a new way to the conferences you like.
Noted - Social music discovery