Okay kiddo, so a mural festival is like a big art show where really tall paintings are made on the walls of buildings. It's kind of like coloring, but on a super big canvas. Lots of different artists come from all over the world to make these paintings and lots of people come to see them. It's like a big party with music and food and fun! And the best part is, after the festival is over, these really cool paintings are left for everyone to enjoy all year long.