My ceremony is at 6:30, in one of the larger hotels in Vegas. Since the size of the hotel can make it more difficult to navigate, as well as the fact that there will most likely be another ceremony after mine, I am concerned about my guests arriving on time. I've read that some people change the start time of the ceremony on the invitations to 15 or 30 minutes prior to account for this, but I really don't want to do that. I am including an itinerary with my invites, which will also include directions to the ceremony and reception. Would it be acceptable to put this on the itinerary: "Ceremony to start promptly at 6:30; please plan to arrive 15 minutes early to allow for seating."
Alternately, I could verbally communicate this to people during our meet and greet the night before, but if some people don't attend then I won't be able to tell them. I could also just note it on my wedding website, but I have some guests who are not computer savvy and wouldn't be going online. Any advice is appreciated!