When I went on TrekCruise in 1989, they staggered the autograph signings (1/2 the passengers at one time, 1/2 at another time). My time was 9:00 one morning. I was so excited, because I would get to add Doohan and Nichols to my cast photo.
Well, guess what diva said that 9:00 was too early to get up for a signing? I was so disappointed, since that was my only time to catch her signing.
It does have a happy ending though. I was riding back on a boat from a private island where they took the passengers for a party. Guess who was on the boat? Didn't have my pic with me, however I overheard her saying she was going to the auditorium to rehearse her show for that night. Ran back to my room, got the photo, and went to the auditorium. She was rehearsing and I waited until she took a break. Surprisingly, nobody keeping people out of the room. I went up to her and asked her to sign the photo. I could tell she wasn't happy, but mission accomplished!