Event Hunt - Startups and Tech Events Curated By Locals
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
TechEvents.co - Tech and startup events aggregator
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
All Design Conferences - A list of all front-end and design conferences
Bigtent - BigTent is a web-based organization and communication portal for groups.