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.
Click here to view a list of all release parties.
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.