It would be useful, especially for scheduling resources, to be able to have pre-defined meeting slots that could be booked. This could be especially useful for educational customers, where the day is normally divided into well-defined periods of time for classes.

You can get some ideas as to how this might work by looking at how it is implemented in Google Calendar:
https://support.google.com/calendar/answer/190998?hl=en
https://www.youtube.com/watch?v=YJ97hx8-mdA

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