As part of an evening dealing with diversity/disability or an evening about the alphabet, teach young people what braille is and how/why it is used.
Ask them to create their own short message or a word by sticking red lentils onto card then swap with another six to decipher each other's messages (blindfolded).
Write their own name in Braille.
Also this activity can help validate Leader's Module 7 'Valuing Diversity'
Card, lentils, guides to the braille alphabet. It may be easiest to pre-draw grids on the card. Double sided tape or glue stick rather than PVA glue.
Real life examples of how braille is used (clean detergent bottles etc)