The story would begin after the events of Frozen 2. Elsa would organize Anna's wedding with the help of the castle servants and the Northuldras. While Anna prepares for her wedding, choosing the best dress with Olaf's help, Sven would help Kristoff stay calm, as he's so excited because the best day of his life is almost here. But not everything would be perfect.

 In this case, I have three possible endings for the short: first, Elsa as the protagonist; second, Olaf as the protagonist; and third, Kristoff as the protagonist. 

If Elsa is the protagonist: Elsa, trying to organize Anna's wedding, accidentally discovers a new power in her anatomy that causes ice chaos, ruining everything. Anna, as always, would encourage her, saying she's never ruined anything, and they fix everything in the end with a song.

If Olaf is the protagonist: Olaf feels lonely and tries to find love. He would ask Anna what it's like to have someone who loves you.

If Kristoff is the protagonist: Kristoff would be so desperate about his wedding. He wouldn't know if he'll be a good husband for Anna and a good King for Arendelle. A great responsibility would soon be upon him when he gets married. And his parents would probably come to visit him to give him the best advice to help him on his wedding day. 

All three storylines end with the preparations complete and ready for the wedding day. And the mysterious villain would watch from afar, waiting for the wedding to ruin it herself. And the credits of the short film roll.

Which storyline do you like best? 

Idea for the plot of the Frozen short film for October.