Use colored dots to make groups easy. Put a different colored dot on each desk in a group. When you need to have a student from each table do something, you can simply ask for all the green dots to bring you the papers from their group.
I use these Whole Brain Teaching attention getters on a daily basis with my ELL students. These attention getters are a great way to improve your classroom management. I usually pick one or two to teach the class at the beginning of the year. Then every month or every few weeks, I introduce a new attention getter, which my students can't wait for!!