King Charles III makes his official ascent to the throne, but the afterparty is shaping up to be anything but epic.According to reports, a long list of British A-listers, ranging from Elton John and Ed Sheeran to Harry Styles and Adele — even the Spice Girls — have declined invitations to perform at the big bash.And while John and Styles are said to have declined due to scheduling conflicts, as the Sun reported on Feb. 25, experts say it’s no wonder so many others have given firm no’s to The Firm.