Eris0303, keep in mind that the producers couldn't force her to do the parade filming or any other performance for that matter that isn't part of the 8 show a week schedule at The Palace. Anything like a parade or a morning show performance etc, is above and beyond the contract of the performer. Of course, if they decide to do it they get financially compensated. However, it is their choice should they decide not to do it.
For all we know, Karen could have been sick and tired of filming and doing the same song for TV time and time again and felt that she needed a break from it.
And as for the elitist sense of entitlement when it comes to seeing a performer. Suck it up, it's live theatre and there are only three things that are sure fire guarantees. The name of the show, the theatre that you're seeing it in and your seat number. Anything else other then that is up in the air and therefore off limits in terms of complaining.
"If you try to shag my husband while I am still alive, I will shove the art of motorcycle maintenance up your rancid little Cu**. That's a good dear"
Tom Stoppard's Rock N Roll