Did you hear how many non-RSVPs showed at the reception hall?
No, I never heard. Although I just thought of a potential problem. If the reception hall resold that time (likely). The other wedding probably had complete strangers showing up at their reception.
Back when I was wedding planning and before we found a location, my mother saw some people decorating for a wedding at this club she just joined. Being a future MOB who had eloped because of parental disapproval, she was probably MORE interested in the reception than I was. So, she helped out. That evening, she peered in to see how the wedding was going. The MOB waved her in. Turns out a lot of the Yes RSVP's didn't show, so they had lots of extra food. It was either 1/3 or 1/4.