Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.

Rooster - Local sharing community where neighbors share free resources

Event Hunt - Startups and Tech Events Curated By Locals

Everyblock - Be a better neighbor

Eventbrite - Discover Great Events or Create Your Own & Sell Tickets

Nextdoor Now - Get the help you need from neighbors you trust