PCGS accept submissions by mail as well as in person but they don't like using the normal delivery system because of insurance purposes, for instance if you send with Royal Mail you are not covered bt their T&Cs as coins are in fact prohibited to be mailed, i use Fedex, you can order a Fedex pickup from their website unless you have an office near you. You can drop the coins off at the fair i listed above but ONLY if you are a PCGS member, no membership equals no submission unless Alan @mhcoins can help out there should you not wish to become a member, but i'm not sure if he wishes to become overrun with people asking him to submit their coins....
All coins are taken and graded in Paris, they won't be graded in the USA