I attended a wedding last weekend and the invitation stated the ceremony was at 4:30pm. Most guests arrived at around 4. The ceremony did not start until 5:30. It was my understanding that it was scheduled to start at 5, which means they added a 30 minute buffer.
My question is are you putting the time you expect the ceremony to start on your invitation or are you adding extra time? I want my ceremony to start at 12:30 so that was what I was going to put on my invitations, but now I am wondering if I should put 12.