To set up a reminder for a specific event on your Microsoft calendar for just one attendee, follow these steps:

1. 
   

   Open the Microsoft Calendar app.

2. 
   

   Select the day and time of the event you want to add a reminder for.

3. 
   

   Create a new event and fill in all the fields, including attendee list.

4. 
   

   Set the reminder you desire prior to the event.

5. 
   

   Save the event.