On this page of the Assassin's Creed Valhalla Siege of Paris guide, you will find a detailed walkthrough of the main story quest called Skal.
Reward: 1,700 XP.
Enjoy the Festivities in Melun
This is a very simple task. You are at a party. You must complete several activities. Go to Toka first. She will propose you a race. Run around a specific area several times to win. You only need to do two laps. Win and you will receive a sword - Ring-sword.
Next, you have to talk to Pierre. He has a different game for you - throwing cheese. You must aim so that the cheese goes over the green rope.
You can also flirt with Pierre here. These interactions will lead you to a casual romance.
Return to Sigfred
You now have to meet with Sigfred. This conversation will be interesting. However, your choices will not affect the plot. Sigfred will leave and appoint Toka as his successor. You will be able to continue partying. Unfortunately, it will be interrupted by a message from Odo - the king has kidnapped the queen and her son.