Here is how it works in our classroom:
1- All students stand by their chair.
2- All students push in their chairs (quietly).
3- Everyone walks quietly to the carpet (or line).
One of the secrets to this technique is that everyone must do each step before we move on to the next one. Also, it must be quiet. Students learned this quickly on day one, and we already have it mastered. It saves us so much time each day!
Here is the 1,2,3 transition in action: