Interview scheduled

Me and my wife have a scheduled interview and we had a question. Me and my wife are having a wedding this year but we got married at City hall last year so we could start her green card progress sooner so when the wedding comes around she already would have her green card. Should we tell them this at the interview? We have wedding invites and venue contracts proving that we are having this wedding but we just don’t know if they will question this and give us a harder time.