Your photographer has the bimah. The guests have table nine.
Professional coverage of a Bar or Bat Mitzvah is built around a handful of fixed moments: the reading, the family portraits, the speeches, the formal set-ups. It is worth every penny and it is also one person, moving deliberately, who cannot be in the back row watching a grandmother’s face during the d’var Torah and simultaneously on the dance floor where thirty thirteen-year-olds are behaving like thirty thirteen-year-olds.
Candle-lighting is the clearest case. Thirteen candles, thirteen short dedications, and in almost every one of them the relative being named is the person holding up a phone. Those clips are the record of who was there and what was said about them — and they stay on the phones that made them unless somebody gives the room an easier option than emailing a family they barely know.
That option is a printed code. You create the event in under a minute, print the QR code for the sign-in table and the place cards, and guests upload from the phone as the day goes. If your community does not photograph on Shabbat, none of this has to happen during the service: the code can go out at the Saturday-night party or the Sunday brunch, and guests can just as easily upload from home on Tuesday.
Afterwards a parent opens the private host page and downloads everything in one archive — the professional set and the guest set, side by side, which is the only version of the day that actually looks like the day.