On this page of the Assassin's Creed Valhalla guide, you'll find a detailed walkthrough of An Althing for the Half Grown side quest in Snotinghamscire.
Reward for completing the mission: 1200 XP.
In the place marked in the picture above, you will meet a group of children who have arranged a meeting to vote on several issues. Each time, it will end in a tie, so you will have to join the vote by sitting on one of the stools.
Matters presented at the meeting are:
- Where the kids will play the next day;
- What will their gang be called;
- What happens to a Pict soldier if they manage to catch one.
The task will be completed when you vote on each of the above topics.