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.
"These are so cute! I love how they how he placing to accept or decline the invitation and also a place to mark their entree selection. These are cute and go with the invitation perfectly."
"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."