we actually got all of ours done in ATL airport, ironically, in 2020. My son's was a breeze; my daughter's interview was cancelled twice, but we rescheduled and got it done (before expiration, in fact).
I give FlyerTalk a *TON* of credit for (1) guidance, and (2) keeping me mentally stable.
You just have to keep checking around the beginning of the month (possibly also half-month/15th, but I didn't see openings then).