Prince Harry's attendance at coronation causes controversy.

Buckingham Palace confirmed that Prince Harry will attend King Charles III's coronation on May 6, while Meghan Markle will stay in California with their children. The announcement came after the RSVP deadline passed, leaving many wondering if Harry would attend. Etiquette experts advise hosts to send invitations months in advance and include a deadline to reply. Guests should RSVP as soon as possible and apologize if they're submitting a late reply. Late RSVPs can cause issues for event planners, so guests should be mindful of their response time.