From the webpage:
December 4th Santa Clara, CA
MongoSV is an annual one-day conference in Silicon Valley, CA, dedicated to the open source, non-relational database MongoDB.
There are five (5) tracks, morning and afternoon sessions, a final session followed by a conference party from 5:30 PM to 8 PM.
Any summary is going to miss something of interest for someone. Take the time to review the schedule.
While you are there, register for the conference as well. A unique annual opportunity to mix-n-meet with MongoDB enthusiasts!