Create an offence, similar to the one that applies to designated football matches, of going onto the 'field of play' at a designated sporting event, without lawful authority or reasonable excuse. The rationale being to deter incursions onto the field of play by protestors or attention seekers.
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Only football matches are currently covered by a specific offence, and incursions onto the field of play at other sporting events are becoming a regular occurrence, to which no specific offence applies. These incursions create annoyance to spectators. They also create risks of injury (and, dependent on the sport, even death) to sportsmen and women, staff and the individual concerned.