Okay, so a conference on college composition and communication is a big meeting where lots of grown-ups (like teachers and professors) get together to talk about writing and how people communicate with each other in college.
Imagine you're going to a big party where everyone loves talking about words and sentences and how to make them better. At this party, people listen to each other's ideas and share their own opinions on what makes writing good or bad. They might even give examples of really good writing they've seen before.
This party lasts for a few days, and every day it's filled with different activities. Some people give speeches about writing, others have special talks where they show examples of cool things people have done with writing. There may even be workshops where people can practice writing or learn new tricks to make their writing better.
By the end of the party, everyone has learned something new and has ideas about how to make their own writing even better. These ideas might inspire them to become better writers and maybe even write something amazing one day!