Lisa:
We have 5 groups that meet on Sunday morning, 3 on Sunday night, and the same 5 again on Wednesday night. We purchased "bath sheets" which are super large towels in 5 bright colors. Each group is assigned a color and when the children come in they go immediately and sit on their color. Visitors are easy to spot because they are left standing and can be introduced to their shepherd and group. Each group then lines up as they are called and go to their rotation of the day. This method has cut down on noise and confusion for us. Hope this helps.
Rotation.org's Sunday School Lesson & Resource Forums

We are an online community of Sunday School teachers, Christian educators, and pastors creating, collecting, and sharing free and premium Sunday School lesson plans, creative ideas, and discussion. We are also the official website of the Workshop Rotation Model (The "WoRM"), a creative way to organize and teach Sunday School. Visit our Bible story lesson forums. View our creative Writing Team Lesson Sets. Explore our 24 downloadable Bible story software programs. Get a free Registered Membership or become a Supporting Member for full access to all site resources. Learn more about our volunteer-led, ecumenical, non-profit, ad-free resource ministry!