Hard to say without context of the situation. I don't believe they have protected the site only on account of you.

It makes sense that invitations to the site would have been extended as part of the general invites to the event.

I am concerned however that you have repeatedly been to this site and made an effort multiple times to try to enter it. This is not a positive thing and I discourage you from doing so again. Is there a reason you keep doing it? I wonder how healthy it is to keep trying.

Instead, I would just try to accept the fact that you have not been included. Note this may not be a bad sign upon you. It could be that numbers were limited.