So kiddo, once upon a time, people wanted to tell machines what to do. To do that, they needed to write something called a "programming language" which the machines could understand and follow. Over time, people created many different programming languages, each with its own way of making the machines do what they wanted.
Now, imagine all these different programming languages were like different colors of crayons in a box. Just like you can draw different things with different colors, people could use different programming languages to make all kinds of different programs and apps.
One day, some very smart people decided to have a big meeting called a "conference" where they could talk and learn about all the different programming languages that existed. They wanted to share ideas and figure out how to make programming easier and more powerful for everyone.
At the conference, people gave presentations and talked about the history of different programming languages. They discussed how they could be improved and what strengths and weaknesses they had. Some people even showed off new programming languages they had created.
So, the history of programming languages conference is like a big meeting that lets people who love programming get together to talk about the different ways they can get machines to do what they want them to do. It's a chance for them to learn from each other and share their ideas, just like when you and your friends draw together with all different colors of crayons.