Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Skyscanner - Skyscanner.com compares over 1000 airlines to find you the cheapest airfares, fast.
Event Hunt - Startups and Tech Events Curated By Locals
KAYAK - KAYAK is a travel search engine that searches hundreds of other travel sites at once. Our helpful tools & features find you the information you need to make the right decisions on flights, hotels, rental cars and vacation packages.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Momondo - Find cheap flights with Momondo.