I used this to create a Parent Teacher Conference Appointment Page. I built a Sign Up page with available appointments. Then I sent the link for it to parents using the Remind App. Parents have been signing up daily. Love it!
If you are not using the remind App you could send it to parents by email. You may want to send the Remind App to their phones with a note that it will take them to the Parent/Teacher Conferences Sign Up. If all that fails, then I would send home a Parent/Teacher Conference Notice with the link to the sign up page.