A theme is your event's coat. A concept is the skeleton.
A theme like 'Space Odyssey' or 'Back to the 80's' determines how it looks: décor, music, clothing. Fun, but superficial. A concept determines why it is that way and what it makes the visitor feel. A concept has a goal, a message and a mechanism: something that makes people not just watch but join in.
The simplest test: take away the title. If something that holds up remains, you have a concept. If nothing is left, you only had a theme.
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