The relevance of auto shows as a showcase for brands and new model debuts is being questioned as automakers are increasingly holding their own events or choosing to attend smaller, but more diverse, interactive showcases such as the UK's Goodwood Festival of Speed. The shift is underlined by the list of brands that will skip next month's Frankfurt auto show (see table below). The absentees will include Peugeot, Fiat and seven other marques that account for 20 percent of all sales in Europe.