Deactivate the real bomb - the dining hall could be filled with tons of black balloons with secret messages inside. The kids pop them to find a specific message. I did something like this to start Nicholas's treasure hunt (balloons were canon balls, not bombs).
The Game Day snack no one can resist! These Cheesy Buffalo Chicken Bombs are stuffed with ranch, buffalo, bacon and cheese wrapped inside a biscuit. The perfect appetizer for hosting your friends and family.