Hi, mmmm, I have a 9ft circle. I used stone effect flooring that is waterproof, and can be rolled up, although I have painted the required names which makes it rather permanent, have you considered painting/drawing the circle and any other design reqiured in a permanent medium, and leaving spaces where you need to fill in different names on a regular basis with chalk or something similiar. The flooring I have can be easily cleaned of chalk etc.
Loki
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