If your playroom is such that running it's length is possible then you might want to reconsider the layout of your room moving furniture to create a maze pathway instead of a hallway pattern to curtail the running. Setting up a play yard works too in the sense of corralling the dressed ones or all of them and taking them out one at a time to dress.

Don't be afraid to raise your voice and let them know what you expect and that they can fool around for their parents - which they all do - but at daycare they will follow the rules and do as they are told. Some kids have never heard that.

I also try to keep the children focused on the activity at hand and find the trend towards diversions like games or singing or what not is actually just more noise and confusion in the midst of an already busy event and more distracting than helpful but maybe that is just me. We stand, we sit, we walk, we listen, we do as we are told and we don't need a marching song or I spy game to do it by - we do it just because.

If you can get your parents to purchase one piece snowsuits for at daycare that makes dressing much quicker as you can lay each one down on the floor and the child sits on the suit putting their feet in, you go around and put on the boots on and mitts. Then each one is stood up and zipped. It goes much faster and is easier for the little ones to dress and undress themselves.