Before that, George joined his parents and siblings at his great-grandmother Queen Elizabeth IILondon’s Platinum Jubilee Celebration in June

As part of the festivities, the royal family headed to Cardiff Castle in Wales, where Kate and William let Charlotte and George check out the show’s music setup backstage.

“Cardiff! It’s been an honor to be with you at this #PlatinumJubilee weekend!” the royals wrote on a June 4 Instagram post. We had an extra special drum demo for George and Charlotte. Also, we saw the Wales Youth Choir for Good perform and got a peek at their performance. [sic]You will be amazed at what today’s show can look like!”