Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Party with a Local - Party with a Local is a free app that connects travelers with locals that want to party.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Atmospheir - Fastest way to discover, connect and chat with your contacts
Bylde - Bylde is a SaaS platform you can use to Start, Manage and Grow your groups and communities.
Overnight - Book a last minute room with locals, in seconds.