The Upcoming.org REST API is available for non-commercial use by developers to build applications by providing access to all public information stored in Upcoming's databases. Upcoming.org is a collaborative event calendar, completely driven by people like you. Enter in the events you're attending, comment on events entered by others, and syndicate event listings to your own weblog. The set of methods provided allow for manipulating and extracting data from Upcoming.org with simple HTTP GET and POST requests in a RESTful fashion.
All responses are formatted in XML.