How about "H, I'm going to be pretty busy over the next few days, so I just wanted to touch base with you about this weekend. Is there anything I can do to help you get ready for [the visitors]? I'm happy to help, but I'd like to plan ahead a little this time."
This shows 1. You are not planning to take on the supervisory role 2. You are expecting him to take the lead 3. You are willing and ready to help 4. You have boundaries that need to be respected 5. You have other plans (GAL)
