Par4QC You do not just 'show up' to the ball, without the invitation, sorry.
It's semantics. Do you think they just send out the invites a week before the tournament? Phil likely had his invite already. That's why they asked him not to come.
Who decides who gets invited to the Masters golf tournament?
The Masters golf tournament is technically an invitational. But that doesn't mean a committee of Augusta National Golf Club members sits down and decides who gets to play and who doesn't. There are qualifying criteria for playing in the Masters, and a golfer who meets one of those criteria automatically qualifies to receive an invitation to play.
One of those qualifying criteria is a past champion so he automatically qualifies.