It's by design.  It helps to keep the same details in your copy of the
meeting and that of your attendees.

If you're lucky enough to have one of the Office versions that includes
OneNote you can link Calendar items to notes in your notebook.  I promise I
don't get any money from Microsoft for pushing their product, but if you're
already paying for it you may as well use it :o)

Maybe someone without OneNote has come up with a good workaround, but
necessity being the mother of invention and all, I haven't so far :o(