A universal theme is an idea that applies to anyone regardless of cultural differences, or geographic location. Universal themes are ways to connect ideas across all disciplines. It is a central idea about the human condition. It is a generalization about life or human nature; they deal with basic human concerns.
The author is giving details and purpose to this event and is inviting people to come to attend it. They even tell you how you can get to the event and about the designated "drop zones".