Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
AllTrails - Explore over 50,000 trails, reviews, and photos. Share them…
Event Hunt - Startups and Tech Events Curated By Locals
Natural Atlas - An evolving, nationwide map of the outdoors
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Outland - discovering unseen places! - Find places that are out of spot but still is worth to visit