Los Angeles CountyBrewery Artwalk and Open Studios on October 25 and 26, 2014 in Los Angeles, CA I have been to this a couple of times and it is interesting and well worth going, especially if you enjoy art and seeing a place that is historical.
Tiller Days on October 3-5, 2014 in Tustin, CA
Silverado Days on October 17-19, 2014 in Buena Park, CA
2014 Pumpkinmania on October 26 at Tanaka Farms in Irvine, CA
San Diego County
MCAS Miramar Air Show on October 3-5, 2014
San Bernardino County
Enchanted Pumpkin Patch and other pumpkin patches and corn mazes
Oktoberfest 2014 in Upland, CA on October 24, 25 and 26, 2014
Have a good October and Happy Halloween!