This is really an etiquette question, but you ladies are awesome, so I'll ask here
FI and I are not putting a fake time on our invitations. Ceremony will start at 6 sharp. Our family and friends, though, tend to be late to everything. (We are Hispanic, so 5PM on an invitation means the party starts at 7, and people should arrive at 8). Many people in our crew do the fake time thing, because lateness is such a chronic issue.
My question is this. Would it be rude to stress on our wedding website that our wedding will be starting at 6 SHARP? I'm not going to write a cutesy poem or anything, but maybe something like "Please be aware that the ceremony will be starting promptly at 6PM. We encourage you to arrive a few minutes prior to 6 in order to ensure that you are seated on time." Or something along those lines, I don't have the wording down packed.
Or would this be rude to do, specifically for the few people that we know that arrive on time? Would word of mouth work best in this case?
ETA: Paragraphs of course