Invitation

a performance

a room with about 15 people. in the center a table with about 15 cupcakes.
the people are asked to form a line a passed an invitation that reads as follows
1. one-by-one take a cupcake and the paper under it
2. take your cupcake to the location of your choice and eat the cupcake.
3. After eating, make a mark on each paper and return it to its previous approximate location.