The microblogging platform Twitter is beside Facebook the fastest growing social networking application of the last years. It is used in different ways, e.g. to enhance events (conferences) by sending updates, hyperlinks or other data as a news-stream to a broader public. Until now the stream ends with the end of the event. In this publication a new application is introduced that allows information retrieval and knowledge discovery by searching through local stored tweets related to a corresponding event. The architecture of the prototype is described as well as how the data is being accessed by a web application and a local client. It can be stated that making tweets available after the end of an event, enhances the way we deal with information in future.