Talk:Celestial Grand Prix/@comment-189.159.89.215-20150716233635/@comment-10117350-20150717000211

You normally get those by completing an event map (or part of it) and then buying the decoration on the store, but there wasn't a building reward for completing this event.

Most of the recent events didn't have special buildings. The last one to have one was Sengoku in Autumn I think.