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I think there might be something else to consider. Charles has already posted that he thinks the section referenced (grounds where a school sponsored event is taking place) only is meant to apply to school owned grounds. I cannot find any reasonable grounds to disagree with him and give in to his legal training and knowledge.

But, the OP referred to a high school sporting event. This is slightly different and the premises where this is taking place are off limits. This does invoke the definition of premises as the building, so if it is in one building in a park, other buildings are not affected. I also note that I don't think Charles argument about it only applying to school owned property would hold here. Since it is included with other sporting events that take place in various facilities owned or operated by others, I think it would make the city park building off-limits. But since it only applies to the one building, the rest of the park would not be off limits at the same time.