How can I get the plates for my new used car if i can never get to the dmv in time before they close?

Well you're going to have to have somebody else that you know go get them for you with a notarized letter from you of course and all the paperwork needed life insurance copy of your photo ID bill of sale saying that you have purchased a vehicle and that'll probably be about it

If you write a letter of authorization for someone giving them permission to register your vehicle they will be able to do it for you. Just make sure that the letter is signed with the vin number along with all the needed documents of course!