You don’t mention a location.

all CE interview locations - both for scheduled and enrolment on arrival - are listed in their separate categories- on the website. Most are at airport but some major cities have locations actually in the city - Chicago and Manhattan -come immediately to my mind though that latter may soon change!

note enrolment on arrival is only for those arriving off international flights.

the key to getting an interview a lot of regular checking of available appointments as people cancel and more get released.