This Week in MongoDB: April 29-May 4` showcases various upcoming events and webinars related to MongoDB, including free online courses, user groups, and training sessions. The blog post highlights several interesting talks lined up for `MongoDB San Francisco`, featuring use cases from eBay and Groupon, as well as a workshop on "How to Save $100 Million With MongoDB" by Edouard Servan Schrieber. Additionally, the Ruby Team will be discussing Natural Language Processing with Ruby at RailsConf, while 10gen CTO Eliot Horowitz will discuss the future of 21st Century Databases at Database week.