The event is for youth, and they plan the event. They chose a Disney theme. Will Disney have an issue with this?
Disney is one of the biggest and most litigious entertainmeent companies on the planet. Please see this similar Q & As about a non-profit event involving Disney IP. You can research others here under "Research Legal Issues" under "Disney" to see all the Avvo posters who want to trade on Disney's IP.
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Just because an organization or event is supposedly nonprofit, it does not get any special dispensations when it comes to the use of intellectual property. You might inquire what else is this group doing with the Disney theme. It is one thing if they buy and use authorized Disney merchandise, but they too could run into trouble if they are using unlicensed reproductions of Disney characters.
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