To create a user role with seasonal grouping permissions, from the navigation, select Settings > Permissions > Org Roles. Then you will find your list of roles. Click on Add New Role.
Select Seasonal Grouping Administrator from the Template Roles section.
Once here, give your role a name and begin to check off what rights you want this role to have. Remember that to manage is to alter/edit/add, and view is just to "See It" only.
The template automatically sets up certain rights. However, you can alter that. Giving more control or access to the user.
When done checking off your selections, go to the bottom of the page, click Save Info & Permissions, and begin adding your users.