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Keep the cupcakes in the fridge or freezer until you're ready to serve them. Turn off the lights and place the cupcakes under a blacklight to serve them.
Keeping the cupcakes chilled will help them hold their shape until you're ready to show them off. If it will be a day or more before you serve the cupcakes, keep them in the freezer, then transfer them into the fridge about an hour before you're ready to put them under the black light. This will allow the cake to soften before you eat it. If you have any leftovers, you can keep them in the fridge for several days. In order to get the glowing effect, you'll need to turn off all of the lights. Arrange your cupcakes under or near your blacklight, then flip it on to see them glow! Your guests will be wowed by this simple science trick! The glowing effect will be more obvious at night.