I am sorry. The {{ eventKind }} event you are registering for (#{{ eventId }}) has already concluded.
I am sorry. The {{ eventKind }} event you are registering for (#{{ eventId }}) has been canceled.
I am sorry. The {{ eventKind }} event you are registering for (#{{ eventId }}) is already full.
I am sorry. You have reached this page by mistake. Please check your RSVP link or contact the person who invited you to see what kind of URL they are using. (The link is supposed to have a paramater in it like "{{ idParam }}=12345" with a distinct number for the {{ eventKind }} event you're trying to register for. Without that, we do not know what event you are trying to attend.)
I am sorry. You have reached this page by mistake. Please check your RSVP link or contact the person who invited you to see what kind of URL they are using. (The link is supposed to have a paramater in it like "{{ idParam }}=12345" with a distinct number for the {{ eventKind }} event you're trying to register for. But your {{ eventKind }} event number, {{ eventId }}, doesn't seem to exist.)