Explain that prayers of intercession are simply prayers for a particular place, person or situation that we bring before God asking him to intervene.
Explain that people are welcome to pray for anything that they would like to, giving a few examples of things that people will be aware of, perhaps situations that are in the news that week.
Ask them to spend a couple of minutes talking to the people around them about what they would like to pray for.
After a few minutes ask for a few examples and then explain that rather than speak out loud or write something down you are simply going to spend a couple of minutes praying silently for any one of the situations that have been brought to mind.
After a couple of minutes close by saying the Lord’s prayer together.