Cvent - Cvent's event management software provides event planners with a complete solution to increase event attendance and decrease event costs.
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.
EventMobi - EventMobi is an interactive mobile event app, audience response and engagement platform for conferences and trade shows.
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.