Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Speaking.io - Brutally honest public speaking advice
Event Hunt - Startups and Tech Events Curated By Locals
Konflist - Curated list of tech conferences all around the world!
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Notist - Create your permanent public speaking portfolio.