You won't be able to dismiss this by usual means (escape or click button), but you can close it programatically based on user choices or actions.
"We had to edit this card a great deal as we're going to have a cocktail reception. All our modifications were done as requested. My only regret now is that we're asking more than one person to reply per card and only after receiving them I noticed that the verbs are in the third person of the singular. We'll work around it."