I realize this is late, but... Better late than never!
Here is a simple calendar for those of you who happen to got to my church. The group for little guys in our church ages 3-11 is called Primary. The children are given a chance every now and then to offer a prayer, give a scripture, or present a short talk during the kids meeting block of classes on Sunday.
Below is a printable I use to help me keep track of who has had a turn and when!
CLICK HERE to download.