They pray for those who are coming and those who can't make it. They intercede for all the needs of those who attend and then make themselves available to pray with those in need after the meeting is over. The schedule is 15 minutes of prayer, one hour of study, and 15 minutes of prayer. So, you have something, such as this newsletter, or your prayer meeting, that needs people to pray for it on a consistent basis. So, starting with prayer, ask the Lord to raise up intercessors for your need.
Intercessors tend to be low profile people.
They are not called to stand in front of the room and brag about their service. The exact opposite is the case. You pray, of course, that the Holy Spirit will show them to you. You will be surprised and amazed at the people the Spirit will select for you, and you will be extremely blessed. People who are intercessors are quietly bringing God's Kingdom into reality, through prayer.