The CartoDB community is hosting a free GIS demonstration this Thursday, May 30th in San Francisco, where they will show how to build applications using open city data with local developer team Daniell Hebert and Steph Tryphonas of Lab228. The event will be held at the San Francisco Department of Technology and attendees are encouraged to bring their questions and suggestions. CartoDB is also hosting various events throughout the week in San Francisco, providing multiple opportunities for developers to meet and discuss CartoDB.