Substitute Ideas for Start of School? ( I will miss 1st 6 student days)

What ideas do you have for starting AP CSP with a substitute teacher?

I will miss the first six student days of school this year. (Not ideal, I know!) Goal is for classes to be fun/interesting and useful for my AP CSP students. I do not want to start Unit 1 until I return. I want to set the class tone and expectations myself for ABC/CBV, etc.

Some, but not all, of these students have had previous CS courses, including parts of CSD. Students are mostly sophomores, with some juniors and seniors. Logistics: I use Google Classroom as well as other ed tech tools. The sub can join the class as a student, so she/he can see assignment details.

Thoughts? Thank you!

Anne Trachsel