I'm going to start decorating the house on June 1 day, but I can't write everything in the yellow calendar. Is it okay?

If you pay attention to feng shui, don't pretend. You'd better do it after July. Or if you are considering renovation, just look for a feng shui master.

July is Ghost Festival, so those new things are not decorated at this time.

You're right downstairs, but you know it. If you don't believe it, you don't. The key is to look at yourself.