Happens all the time in business--someone invites a hated rival to his daughter's wedding, confirmation, Bar Mitzvah, etc., as a way to show "civility" and "class." Happens in the Mafia business, too.
By some accounts, several thousand people, including most of the NY Mob hierarchy, were invited to the wedding of Salvatore (Bill) Bonanno and Rosalie Profaci.
That's why God invented place cards for seating.
