A VCDX Bootcamp is a half day session (little less) that can really help you in the VCDX preparation, expecially to understand the entire VCDX process with more attention on the application and the defense part. In my opinion could be a must for each new VCDX (I wasn’t so lucky and I wasn’t able to attend it). There is also a book: VCDX Boot Camp: Preparing for the VCDX Panel Defense. But honestly be part at this live experience could be completly different.