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.

Upcoming.org - A simple way to share and discover interesting events

Eventbrite - Discover Great Events or Create Your Own & Sell Tickets

Colloq.io - Discover a new way to the conferences you like.

Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.

Visit a City - Create your personal travel guide