Stormia - Beautiful animation of live weather in the US
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
US Health Weather Map - The U.S.
Facebook Local - Discover places to go and events happening near you
Dark Sky - Hyperlocal weather information, now on the web ⛈
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets