You are most welcome. Thank you for your reply, Rossef !
Re: "If I am in a faceTime call and another person calls can I simply add them to the call
Seems you have choices:
✽. Accept an incoming call: Click Accept.
✽. Accept a video call as an audio call: Click
next to Accept, then choose Answer as Audio.
When you’re in an audio call or a phone call, the camera is automatically off.
✽ Accept a video or audio call and end a current call: Click End & Accept.
✽. Accept an audio call and put the current audio call on hold: Click Hold & Accept. When you end the new call, the call on hold resumes. You can pause one audio call at a time.
Above is from: Answer calls in FaceTime on Mac – Apple Support
_______________________________________________________________________
Re: FaceTime:
The way I understand it (and I'm no expert) for your scenario, either you:
(1) initiate one group call, (or maybe one in the morning, one in the afternoon ?) inviting people (eg via Messages) with a link generated from within the call. People with the link can join in. or drop out, as they wish for as long as you keep the call active ...
or
(2) you accept incoming calls as you wish. Calls arrive one by one ... seems you would need to end one call (or put on hold, receive other as audio) end first call, and use video again for the new call (ie: when the camera is free again after the other call).
Guessing you would be the best judge of what would be the most pleasing for your mother on her special day, and how much time you are willing to devote to "monitoring" FaceTime callers for her, on the day.
BTW: To any FaceTime experts out there:
please feel free to jump in, if there's a better way, or better suggestion!
All the best !