Eventjoy - The Easiest Way To Organize An Event
EventsBase - Find the best professional events nearby or globally
Meetup for iOS and Android - Discover groups that are all about the things you love
Rally by Eventbrite - Find the best local events and rally your friends to join
TechEvents.co - Tech and startup events aggregator
Komos - komos.io is a free tool, that helps you discover comedy events near you and get event tickets for your favourite comics.