I know most of you probably saw me mention this before, but my little sister/MOH has severe epilepsy, and we can't have any flash photography at the wedding or reception. The chances of her having a grand mal seizure are rare, but she is very susceptible to "petit mal" seizures, which are much less dramatic but still usually leave her feeling light-headed, nauseous, and exhausted for hours afterward. Generally after she has a petit mal, she's unable to function normally and has to sleep the side effects off for a few hours. So you can see why we're trying to avoid her having one (always, not just during the wedding).
I've already spoken to the church coordinator, the priest, our photographer, DJ, and the staff at the hotel where we're having the reception. We're putting a reminder in our programs. The hotel staff told us we should probably put reminder cards on the tables at the reception hall, so that guests don't forget.
Am I just being too overcautious at this point? And if not, should I put cards at each seat, or just one sign on each table (maybe next to the table number)?
I don't want to go completely overkill, but I don't want my little sister getting sick or hurt at my wedding, either. Advice is welcome.

Books read in 2012: 21/50