Bring your micro:bits together and dim the lights. See if you can make them flash and swarm together.
Try to make your micro:bit fireflies work together to perform a flashing sequence.
Get the whole group together and plug in your micro:bits. Start off with only a few and then add others.
Think about how to make the flashing sequence more exciting. Can you make a digital art performance?
Can you code your micro:bit so there are different radio groups of flashing fireflies?
Can you code your micro:bit so the flashes become more frequent each time?
Can you code your micro:bits so they all finish by lighting up fully at the same time?