I did something new this year (and remember, I didn’t teach CS at the beginning of the year last year).
The District Acceptable Use Policy form I gave to students had a place for parents to put their email address. So as I got each of the permission slips back, I emailed each parent that included that the form.
I got nothing but positive responses, and I have placed all the responses in a seperate folder in my email account, so if I do need to contact a parent, I can check for them in that folder.
Basically I just put each child’s name in the subject heading. In the body of the message, I introduced myself and told the parent that they should contact me if they had quetions or concerns.
I did get several questions, all easily answered.