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 ordered this invitation for my parents' anniversary party and could not be more pleased with it. It turned out fantastic, and we've already gotten quite a few compliments on them!"
"Ordered this invitation for my sister's 50th wedding anniversary party, and it turned out perfectly. A big hit with the recipients!"