This news comes couresty of the AKB48 Official LINE account. Voting appears to be over, but basically this was a contest to vote for the top user-submitted Kokoro No Placard messages.
The first place submission appears below. I felt it was worth mentioning, as it’s a very touching message.
To my father in heaven (天国のパパへ）
I’ve finally gotten married! （やっと結婚できました！）
He’s a lot like you.（少しパパに似ている人です。）
I wish you could have met him.（会って欲しかったー！）
How nice (^^. I wonder if there will be future events like these.
Sometimes editor. Sometimes translator. Mostly a proofreader. I like Japan and things.