Which holiday do we celebrate by dressing up in costumes and trick-or-treating?

Halloween

Who famously collaborated with Luis Fonsi on the global hit "Despacito"? In geology, what is the point within Earth where an earthquake originates called? Who was the US general who led the invasion forces in the Battle of Inchon during the Korean War? What classic NES game features a boxer named Little Mac? In which PC gaming platform is the annual 'Summer Sale' notorious?