Visa Application, urgent serivce

<p>I ought to go to the u.s. on 23rd, august. yet I totally forgot my expired Form i-20 before I left school and now I am screwed.While waiting for the new i-20,which perhaps shall arrive around Tuesday, I want to request a urgent service from either the consulate in Guangzhou (interview-free) or the one in Shanghai (near home). Do you guys think that an interview-free application costs much more time than one with an interview, without the urgent service? And regarding my current situation , do I have a good chance to make it applicable? </p>