Court papers state that the boy – while acting with another person wearing a face covering – ran towards Miss Mayer and seized hold of a drum she was carrying.
The charge says that the boy dragged her by the drum which caused her to fall and struck her head on the ground.
The papers goes on to state that the teenager then robbed Miss Mayer of a drum. He also pleaded guilty to behaving in a threatening or abusive manner.
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The charge says that the teenager was part of a disorderly crowd, repeatedly shouted, swore and challenged others to fight.
Papers further state he uttered offensive remarks and threats of violence.
The Crown accepted a plea of not guilty to a charge that said the boy resisted, obstructed or hindered two police officers in the execution of their duty.
It was said he ran away from constables Colin McCartney and Jonathan Fairlie and struggled with them.
Sentence was deferred pending background reports until next month where more information regarding the circumstances will be heard.
Sheriff Jonathan Guy granted the boy, of Coatbridge, Lanarkshire, bail meantime.