Okay kiddo, the Day of Slavonic Alphabet is all about celebrating a special alphabet that was created a long long time ago! It's called the Cyrillic alphabet and it's used in many different languages today like Russian, Ukrainian, Bulgarian, and many more.
Now, the Bulgarian Enlightenment was a time when people in Bulgaria wanted to make their country better. They wanted more people to know how to read and write so that they could learn more and do more. So they did a lot of work to make schools and books for everyone to use.
Culture is a special way of life that people have in different places. It includes things like art, music, dances, food, and more! Bulgaria has a really cool culture and they celebrate it on the Day of Slavonic Alphabet because it's important to remember and appreciate where their language and culture came from.