Check out this great new tutorial from Erin St. Blaine: Create a parasol that contains a couple hundred UV BlackLight NeoPixels and a Circuit Playground Express. Carry it around and you’ll have your very own black light spotlight wherever you go!  From the guide:

Most parasols are designed to keep UV light out. This one is designed to bathe you and your snazzy outfit in ALL the UV light, and make you glow like the Rockstar Candy Raver you are.

This guide details how to work with UV NeoPixels and make a very sturdy and festival-proof prop. It will still keep the harsh rays of the sun away during the day, but flick the switch at night and let the UV pixels underneath light up and put you in the spotlight.

UltraViolet NeoPixels are a relatively new invention and we can’t wait to play with them! This tutorial makes great use of the pixels, spreading out the light to give maximum glow power to whatever you’re wearing under the parasol.

See the full tutorial on the Adafruit Learning System: https://learn.adafruit.com/personal-blacklight-uv-parasol