Google calendar has changed into a new look since the end of last year so some steps might be a little bit different from the ones used in the previous calendar environment.
A video tutorial on how to set an appointment slot using Google Calendar
Another favourite app of mine called Boomerang Calendar could also be used to plan a group event but not applicable for a one-to-one appointment. I like how user-friendly and straightforward this app is.
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| Boomerang Calendar |

