Permissions to add/edit all entries in a list, without giving 'Manage Lists' permission

Question

Is it possible to set permissions for a SharePoint 2010 list (a Calendar in particular) to allow editing all entries (not just ones the user creates) without given them Full Access or Manage Lists?

Update Some users will want access to only edit their own items, others edit any (but not manage the list)

Answer 1

You can create a custom permission level. This will give you the possibility to grant only the permissions you want to. Here is an article about how to do it:

http://technet.microsoft.com/en-us/library/cc263239.aspx

Answer 2

Disable the item level permissions in Advanced Permissions so users can edit all items and give them Contribute permission to the list.