Stubhub is looking to the summer to float the idea of an initial public offering (IPO) to the tune of $16.5bn. The digital ticketing service has been working with banking heavyweights JPMorgan and Goldman Sachs for the past two years, according to a report from The Information. Stubhub IPODigital and online ticket sales have seen constant growth over the past decade. This is down to apps and online services becoming more accessible and portable to gain entry into music and sporting events. Stubhub has been an established brand for several years and was previously valued at $16.5 billion in 202…