Guides by Lonely Planet - Explore city guides curated by experts.
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Flamyngo - Create a city guide with help of your friends.
Event Hunt - Startups and Tech Events Curated By Locals
Maply - Waze for things to do 🗺
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets