A system and methods for providing location-based upcoming event information using a client-side web application implemented on a client device are described. The location-based upcoming event information may be provided to users of an online secondary ticket marketplace using a client-side web application implemented as desktop or mobile widget or within a web browser toolbar. The client-side web application may be configured to communicate with a network-based system that provides online marketplace and ticket fulfillment services and generate a query based upon the location of a user and other event criteria. The client-side web application may communicate the query to the network-based system and, in response, receive location-based upcoming event information which may be displayed to a user as a list and/or information on a map. The client-side web application may display an aggregate of ticket inventory available from multiple online marketplaces providing the user with multiple purchasing options.