Halloween events in Southern CaliforniaHere's a list of Halloween events around Southern California. Halloween at the Fullerton Train MuseumFullerton Train Museum200 E Santa Fe Ave, Fullerton, California 92832October 18, 9 a.m. - 12 p.m. Grab your best costumes and bring the family to the annual Halloween event at the Fullerton Train Museum. Downtown Halloween Costume Contest at 5:30 pm:Show off your scariest, funniest, or most creative costume for a chance to win fantastic prizes! If you know about a great local Halloween event, share it with us on Facebook, Twitter or Instagram using #abc7eyewitness!