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

JustPlan - JustPlan is a marketplace that connects customers with high quality, reliable, and vetted vendors who offer products and services for small events, gatherings, and parties.

Event Hunt - Startups and Tech Events Curated By Locals

PartyTalk - An efficient, fee-free event planning & ticketing tool

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

Plans - Coordinate a group plan, then gather memories in one place