Eventjoy - The Easiest Way To Organize An Event
Extravaganza - Airbnb for live entertainment!
Flyer by Paperless Post - Fun to create. Easy to share. Totally free online invites.
Seatify - Reserve a seat at cafe & office from people there
Event Hunt - Startups and Tech Events Curated By Locals
Guestlist - Market events online, accepting registrations & ticket sales