Each weeknight leading up to Prince Henry and Meghan Markle’s wedding, PBS presents a series of programs highlighting preparations in London that week, with highlights on royal wedding etiquette and protocol.

Day 4: How to Celebrate

Learn how the royal family celebrates a royal marriage. Experts and commentators join Vieira and Baker to talk about everything from the carriage procession to the cake. Anita Rani reports from Windsor Castle, where preparations are in full swing.