Short answer
The best approach is prevention. Before guests arrive, place all cheese platters and snacks on high counters or inside closed cabinets where your cat cannot reach. Politely ask your guests not to feed the cat any table scraps, as many people don't realize most cats are lactose-intolerant. If your cat does sneak a tiny piece of plain cheese, watch for signs of digestive upset like gas or loose stools over the next day. Having a designated quiet room for your cat during the party can also keep them safe and stress-free.
Cheese — Food safety facts
Feed with care · Cats · full breakdown on the linked food page
Most pets are lactose-intolerant to some degree. Tiny pieces are fine as treats; avoid if your pet gets diarrhoea.
The full verdict, portion guidance and serving notes are collected on the Cheese food facts page.