Up to 100 places are up for grabs on a celebratory glow in the dark bike ride through the heart of Edinburgh to celebrate the Capital becoming Scotland's first 20mph city.
http://www.edinburgh.gov.uk/news/article/2440/join_the_glowride
It seems that this involves taking your own bike and fitting LED lights to it for a three mile ride. It isn't clear if the lights have to be returned afterwards or not.