Eventjoy - The Easiest Way To Organize An Event
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.
Meetup for iOS and Android - Discover groups that are all about the things you love
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
TechEvents.co - Tech and startup events aggregator
Event Hunt - Startups and Tech Events Curated By Locals