UpCamp - Book the dates you want at the best campgrounds
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
The Outbound - Discover & Share New Outdoor Adventures
Event Hunt - Startups and Tech Events Curated By Locals
Nomadgears - Disposable & reusable travel kit for travelers & nomads
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets