Amazon is taking center stage at this year’s RTS London and will chair the bi-annual convention, with international chief Kelly Day set to keynote. Prime Video and Amazon MGM Studios have been named principal sponsor of the storied event for the first time and Tara Erer, Head of Northern European Originals, will chair. Joining Day in the first tranche of speakers is new Channel 4 CEO Priya Dogra, ITV boss Carolyn McCall and Reemah Sakaan, who has just taken over at Paramount UK network 5 (previously Channel 5). Titled  United in Change: If Not Now, When? , the convention will focus on the need for collaboration and decisive action across the media and television industry.…