August 7th is Peace Sunday, the day after Hiroshima Day. Christian World Service may have an order of service (though not yet). They do have some archived services from past years with good material – check under the heading Conflict and Peace.
Here is the first part of a Prayer for Peace which has been added to our Prayers page
Lord, we pray for the power to be gentle,
the strength to be forgiving,
the patience to be understanding,
and the endurance to accept the consequences
of holding to what we believe to be right.