; and (II) establishing additional terms and conditions for the proposed activity or event is necessary to protect or avoid conflict on or with Federal recreational lands and waters, resources, and programs; and (iv) may issue to a recreation service provider (including a youth group) a special recreation permit for an organized group recreation activity or event, subject to any terms and conditions determined to be appropriate by the Secretary concerned, if the Secretary concerned determines— (I) the proposed activity or event to be undertaken may have more than nominal effects on Federal recreational lands and waters, resources, and programs