Save a calendar ICS or Msg to MHT using MhtFormatOptions.WriteHeader | MhtFormatOptions.RenderCalendarEvent produces something like the following example:
The output doesnt show Optional attendees. Could some one help me with displaying Optional attendees along with the following information in MHTML file genereated using RenderCalendarEvent
Subject: Test Appointment
Location: [https://consilio.zoom.us/j/test ](https://consilio.zoom.us/j/test)
Start: Fri 10/01/2021 08:30 PM
End: Fri 10/01/2021 09:00 PM
Show Time As: Busy
Organizer: John
Required Attendees: Mary