This is one of the quests in Assassin's Creed Valhalla that you can complete during the event called Ostara Festival. You will receive it after arriving to your English settlement - Ravensthorpe.
Norvid has enlisted Eivor's help to make Ravensthorpe more festive. Help him by adding decorative elements around the settlement.
You will find Norvid in his festival store, which he set up in your settlement literally a few steps away from where you talked to Alwis and Alvin. He will ask you for help in decorating the settlement. During your first conversation with Norvid, you will receive 20 Festival Tokens from him.
Approach the five different decorative elements in your settlement and place any decorations you have there.
When you have finished decorating the settlement, go back to Norvid and he will give you 50 Festival Tokens, after which this one-time quest will end.
