Refrigerate or freeze leftovers immediately after the meal. Divide into small containers so they cool quickly. If leftovers have been in the temperature danger zone for more than 2 hours they should be eaten or refrigerated immediately and for more than 4 hours they must be thrown out. Always store perishable leftovers in the fridge and use them up within two to three days. When reheating food ensure that it is hot all the way through (use a meat thermometer to ensure it is at least 75°C in the centre).
If you want to bring home any leftovers, ask your hosts to put your ice-bricks, gel packs or water bottles into the freezer during the party so that you can transport the leftovers home safely chilled. Put leftovers into the fridge as soon as you get home.