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.
"I was VERY happy with my invitation! The only thing I wished was different was that I wanted inner envelopes and they do not come with this invitation."
"the invitations were beautiful. I wish I had realized that the font and size of font I chose was so small. The invites were hard to read without glasses!!"