WinSoCal 2019 at   Cal State Channel Island  

 https://math.csuci.edu/about/wimsocal2019-csuci.htm

WimSoCal 2018 at Pepperdine University          

https://seaver.pepperdine.edu/natural-science/undergraduate/mathematics/wimsocal-2018-conference.htm

WimSoCal 2017 at University of Southern California      

 https://dornsife.usc.edu/conferences/wimsocal2017/home/