I just cannot figure this one out at all.
What kind of calendar?
Acrobat/Reader supports SMTP mail protocol. This mail system does not support Outlook's calendar feature nor any of the many other calendar systems.
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The iCalendar format is just plain text. In theory it should be possible to create such a file from scratch and attach it to the PDF when submitting it. You can't attach it to the email itself, though.
Thank you everyone for responding quickly. I just was not sure if this was possible but was asked by my higher ups so had to follow up :).
Have a wonderful day everyone!