ok to expand on this, you can have him legally marry you at home a month, day, week, before, after, 3am the day you fly out to PV.... 3 weeks later, a year later (ok you get the point) whatever day you actually consider to be your "real" wedding day. you do not need guests or a venue, it can be at home in your kitchen wearing pink fuzzy slippers. it can be as low key or as high falootin as you wish. its just another day to some of us, and to others its just as important as the mexico wedding. according to cali laws you may need some witnesses to sign, so maybe your MOH and BM? bottom line is that for the US to legally recognize a marriage performed in mexico by your own officiant and not a public official of mexico, some form of vows and basic i do's and the signing of the paperwork has to happen and be filed at home.
phew! ok, hope that helps