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WWDC Together - Watch and discuss WWDC together
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
WWDC TV - Watch WWDC video on your Apple TV
Event Hunt - Startups and Tech Events Curated By Locals
NotesKey - Time travel through Apple's keynotes
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets