I'm completely bummed. It has been a long, expensive, and frustrating journey and the no guests policy completely sucks. I understand the concerns, but why not even a zoom session or posting a video of the ceremony after the event. If the government is letting people at full capacity into restaurants now, I can't see having one masked, fully vaccinated, socially distanced spectator allowed per participant as being that much of a threat.
Having gone through the interview process myself in Phnom Penh in May, I highly recommend you attend the interview. It is very difficult to get a visa (work, visitors, marriage) for the USA from the Phnom Penh embassy period. The applicants are interviewed in the waiting area and since we were the 2nd to last people to be interviewed, we heard most of it. Out of the 60 or so applicants, we saw 2 cases approved: One work visa, where the applicant had been waiting over 2 years, and one fiancee visa, where both people were there and it took the petitioner over 30 minutes of pleeding to get the Consulate officer to approve the case. (His case had a red flag, as he had applied for a K1 visa before with a different person. He did not attend the interview at that time, and the case was denied for lack of evidence of being in a relationship. He told the consulate that that particular event caused much strain on the relationship, which then failed. He said he really loves the Cambodian culture and that's why he was applying again with a new fiance, also from Cambodia). Our own application wasn't approved or denied that day (and still isn't), as a K2 minor is involved and that makes the case much more complicated. We have been waiting 18 weeks now to be scheduled for a Maternity DNA collection appointment. The progress is agonizingly slow.
If you already have a date that you can't attend, I would certainly consider emailing the embassy to get a new date that works for you. If you can't attend the interview, make sure your fiance has LOTS of proof of your on-going relationship, much more than you submitted with your application.
Best of luck to you both.
K+P got a reaction from top_secret in Let me know your thoughts (Oath ceremony)
K+P got a reaction from NikaMo in Did anyone pass their Cambodia interview without attending it with your fiance? [edited title]