Also, post signage with a cover charge for entry, and terms and conditions where by entering your property they are consenting to be billed and consenting to the release of all content rights (video, audio, text, stills, etc).

Welcome them. Only $80 per person (dialogue costs extra; cleaning fees are additional; escalation results in exponential charges, etc) to enter.

Stream it, including any attempts to avoid payment. Then pursue them individually in small claims court or your local equivalent for the money. Post the results online (monetize it if possible, because this warrants a PITA benefit).

Alternatively, cover your lawn in cheap buckets for the duration of the event. Then “return” what they “dropped”.

Or, depending on how drunk these idiots are, get some life-sized statues of young children and arrange them in the garden so they’re “staring” at intruders (play recorded kids’ shouts if you like, horrified by the nasty men flashing). Or hide reflective eyes in the bushes. Play targeted low frequency music (it’s all about that bass) that creates a feeling of unease and vague nausea whose origin cannot be discerned.

Or, borrow some actual friend’s kids (consenting teens, with their parents’ consent), chill out in your yard together, and actually call the police on the first offender for indecent exposure in the presence of a minor. Depending where you live, that can get really serious though.