Eventful is a web service which aims to help users search for, track, and share information about events. Eventful is a service of Eventful, Inc. (formerly EVDB, Inc.) from San Diego, California. EVDB stands for "Events and Venues Database", and anyone may add information about events, venues, and performers.
Meetup.com (also called Meetup) is an online social networking portal that facilitates offline group meetings in various localities around the world. Meetup allows members to find and join groups unified by a common interest, such as politics, books, games, movies, health, pets, careers or hobbies. Users enter their ZIP code (or their city outside the United States) and the topic they want to meet about, and the website helps them arrange a place and time to meet. Topic listings are also available for users who only enter a location. Meetup.com was founded in 2001 by Scott Heiferman, Matt Meeker and Peter Kamali.
Upcoming combines features of an event calendar and a social networking site.Primarily, the site is a searchable, browsable repository of upcoming events, such as music concerts, art exhibits, business conferences, and so on. Event information can be contributed by the user community, although an increasing percentage of event data now comes from commercial sources. Users can indicate their plans by marking that they are "going" to or "interested" in an event. Users may also establish "friend" relationships with each other and receive notifications about what their friends are planning. Upcoming also offers users reminders via email or SMS when a particular event is about to occur.