This is a parent contact log that I use in my classroom.
I get parents to fill out their contact information at the top (or fill it in myself if they don't come to open house) and keep all the forms in a binder.
When I need to make contact I just find the correct form and fill out the:
Type of contact
Reason for contact
Most schools require teachers to keep these types of forms these days so this just makes life a little easier!