Alkarta - Find happenings in your city.
EventsBase - Find the best professional events nearby or globally
Party with a Local - Party with a Local is a free app that connects travelers with locals that want to party.
Rally by Eventbrite - Find the best local events and rally your friends to join
Komos - komos.io is a free tool, that helps you discover comedy events near you and get event tickets for your favourite comics.
Vamos - Local Event Discovery