We gather all the grades (K-5) in one room for 15 minutes.

We don't have a music workshop, so the 15 minutes is the only "Sunday School" music they get. We do "campfire" type songs - with movements.  

BTW: This is a great opportunity to incorporate creative ideas from other workshops we are not using for the story this month. We'll often select from Music, or a creative drama idea that's not being used.

The children are dismissed to their shepherds, who take them to the workshop they are in that day. The workshop lasts for a full hour; the 15 minutes gets tacked on at the end. This gives the parents time for coffee fellowship, visiting with others or whatever before they pick up the kids. (It also solves the problem of what to do with the kids when the service runs overtime).

The 4th Sunday of each month, the children attend the worship service for the first 15 minutes, then we have a children's sermon, then the children are dismissed to their shepherds and go to their workshops. It has worked well, but we need to make some adjustments. Most parents respect the extra 15 minutes at the end, but some just want to grab their kids and go, which disrupts the workshop if they aren't quite finished.