It will be necessary to have all invitees (pals/friends) fill in the Parents Permission Form before they can attend your party/celebration event.
You can download a print ready copy here.
These need to be given to all of your Cub Scouts before the event. Explain to them the needs to invite a friend or pal and that their friend must have their parents permission to attend.
You will see on the form that certain information needs to be filled in by the Scouter team before the forms are given to the Cub Scouts.
This procedure is necessary for insurance and child protection purposes.