Appointments using your Google Calendar
Did you know you can access your Google calendar like an appointment book? Using this feature you can schedule a parent teacher conference for your students without giving the parent full access to your calendar, and it will automatically remind them about the meeting without you having to hound them to come! It is really easy to do!
Open your Google calendar in your browser:
Once you open it, you will see your monthly view of your calendar with the menu of options on the left side:
Click on the little down arrow next to Create and select Appointment Schedule. 
I also chose the time frame in which I was available for those dates. On the calendar on those days you'll see that Google has already sectioned off those 15 minute time slots for you.
Too bad Google can't run the conference for you, too!
When you click on it, the above image will pop up. You will see the current week and time slots in blue on the right. These are auto generated time slots. Begin at the top and fill in the details you'd like for your conference availability:
Title your appointments however you prefer. I used conference for this example. You can then set the time frame. There are set time limits or you can add a custom time frame. I chose 15 minutes for this option.
Then choose whether or not your conferences are going to repeat, not repeat, or a custom repeat option. I chose does not repeat for this example.
You'll notice that the bottom options have now changed and show the current date. You will need to add days to mark the ones that work. I've chosen Tuesday and Thursday.
I also chose the time frame in which I was available for those dates. On the calendar on those days you'll see that Google has already sectioned off those 15 minute time slots for you.
Now you will need to mark when the time frame is open for users to sign up for a time slot. I always uncheck these two because I want my options to be available for users to sign up when they get the opportunity. If you want to set those times, you can. These time frames are when your appointments will be open to fill and after this runs out, they will close and no one can sign up anymore.
Leave the remaining options as default if you prefer and click on next.
The next screen shows a few more options like how your information is displayed on the appointment page, location of the meeting, and a brief description of your services/conferences. The option for location is a good one to specify because you can schedule a virtual meeting, a phone call, or an in person meeting. Pick the option that works for you in this setting.
I chose Classroom, in person meeting. You can add a brief description or address here.
At the bottom you can fill out the reminder information. If you want them to know ahead of time about their appointment, this will automatically send them a reminder email. You can specify the time frame as well.
Click on save and this window will pop up showing you your new appointment schedule that you have created.
If you click on Open book page you will see what your users will see when they go to sign up for an appointment time slot.
This makes it easy for them to click on a time that works for them and sign up right away with very little work on your end.
Click on Share in the top right corner and send an email out to the users you want to sign up for a time. Everything will be done automatically after that!
Too bad Google can't run the conference for you, too!