The Mastic Beach Property Owners Association is having their annual Halloween party (thank you Kate Browning). The Knights of Columbus in Mastic is also have a free Halloween party between 5 and 8 PM. You can take advantage of another free party at the police headquarters in Yaphank.
If you decide to go trick or treating, only visit people you know and don't trick anyone - it's really about the treats and having fun. Eat a little candy everyday to avoid stomach aches and toothaches. Watch out for traffic and carry lights at night. Keep safety in mind and everyone will have plenty of Halloween fun.