My best friend lost her adult son. Shes asked me to help plan the memorial service.What do I do?

It is a great honor to be asked to help your friend during this painful time. There are a few things you would need to do before your can start helping. You will need to ask questions regarding the place of worship, what member of the clergy will be performing the service, will it be a private service or open? Also ask if there will be anyone else she like to have involved for doing readings or serve as ushers? Will there be a reception following the memorial service, if so, where would she like it, at her home or at a hall and if it would be catered or home made foods? Ask for names, phone numbers and addresses of people she would like to invite that might otherwise not know of the service. Help prepare the newspaper announcement as well as call the list of people she would like to have attend the service.
By helping with these details, you will be a great help for her in these trying times.