As part of the release of Ubuntu 15.04 on April 23rd, there will be release parties worldwide. This is a good chance to meet users of Ubuntu who use the operating system at home and the lucky few who get to use it in the office.
On another note, the Ubuntu project has their schedule well-planned out. They have a roadmap of the Ubuntu release process and state exactly when the user interface will be frozen, when there will be no new features added to the release, etc. It’s a good example for other larger projects (whether they are proprietary or free/open source) to learn from.