When I was a lad youth clubs had table tennis, warm Vimto and not much else, certainly nothing like this. B.Fest is a Brighton youth festival for 13 to 19-year-olds organised by the Brighton Youth Centre and is in its tenth year. It runs from the 21st to the 28th of October and is jam-packed with things to do.
This video sums it up nicely.
There is too much to list but it covers talks and workshops, exhibitions and music, films and gaming. There is even a free DJ workshop run by none other than Fatboy Slim, though you do actually have to be younger than 19 to attend that. Sorry dads.