TechEvents.co - Tech and startup events aggregator
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform
Event Hunt - Startups and Tech Events Curated By Locals
All Design Conferences - A list of all front-end and design conferences
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets