Full info and resources: https://passdan.github.io/genesequencepractical/
We held a day for Secondary Schools (aka High Schools) to visit the University and were invited to do ~15 min workshops for small groups of 11 & 12 year olds (around 6-10 per group). I put together a workshop loosely described as "Real Life Guess Who", where the students would pull out different 'versions' of genes for Eye colour, Hair colour, Sex, earlobe type etc. and then determine what the person looks like via building the code with coloured ball-pit balls (Update: Now with 3D printed parts!), decoding the colours into bases and searching the database to find out what the sequence codes for.
The full write-up is here, but I think it can be nicely summed up by the series of photos below. Can't include pictures of the students obviously, but they seemed to actually really enjoy it, arguing over who got to be the computer, working out who the subject looked most like out of their class and a couple asked about how you make programs like this.
The 'DNA-searcher' is a simple perl script which loads 12-base sequences corresponding to the face traits on the gene cards by default, but will take any tab separated file for other workshops such as 'what food has this animal been eating'. It contains a lot of `sleep(1)` to make it look like it's doing stuff. I ran it all from a raspberry pi which is now bundled with our kit, but a macbook would work too.
(Full size image here)