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 cards were perfect for my engagement party. I appreciated the fact that the lettering at the bottom of the card was able to be changed to whatever I wanted - instead of it saying "You are seated at table ____" I was able to put "Welcome to the Party!" and everyone loved them. Thank you!"