Research carried out by Novuna Finance shows that the fans of Oasis heading to Cardiff could bring a £100.3 million spending boom with them. The band’s opening shows at Cardiff’s Principality Stadium this summer will be one of the biggest economic events the city will see this year. The first leg of the iconic reunion shows are expected to attract around 149,000 fans. Each concert in Cardiff is forecast to generate a whopping £50.2 million in fan spending, with a net…