It's easy to spot the lack of credible sources to base this story, but it's so common for this kind of journalism covering celebrities shenanigans that as a reader I don't actually care enough to go find more reliable sources about what actually happened, how the prince reacted, or what exactly Adele said when she refused joining the event. The article only wants me to know that some people are not accepting the invite for the coronation party, which means the event lost relevance over time.